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The blue economy can be a driver of sustainable economic development, but it is both subject and a contributor to climate change and environmental degradation.Ocean health starts with freshwater health, but freshwater and ocean policies are disconnected, and water security is a blind spot in blue economy strategies.Subnational governments are competent in policy areas that can improve water quality, such as water and sanitation, waste management and land use; and their investment responsibilities in grey and green infrastructure can foster resilience to growing water risks.1. Understanding the blue economyThere is no single definition of blue, ocean or marine economy, which are often used. The Organisation for Economic Cooperation and Development (OECD) defines the ocean economy as "the sum of the economic activities of ocean-based industries, together with the assets, goods and services provided by marine ecosystems" (OECD, 2016), and divides ocean-based into "established" and "emerging" sectors. The classification of sectors differs from one framework to another: the EC and UN-World Bank propose a synthesised classification of 14 and 15 sectors respectively, while the OECD has a more detailed classification of 21 sectors (see table 1).Considering only established sectors, the OECD conservatively valued the ocean economy at USD 1.5 trillion annually in 2010, accounting for around 2.5% of global GDP and 30 million direct job. In a business-as-usual scenario, in 2030, these sectors are anticipated to employ over 40 million people and to grow to more than USD 3 trillion, maintaining its share of 2.5% of total global GVA (Gross Value Added). Across almost all sectors, employment would grow faster than average for the world economy.Economic growth and employment in many countries, regions and cities hinge upon water and ocean-based economic activities. For instance, Cambodia's blue economy has been valued at USD 2.4 billion in 2015, accounting for around 16% of the country's GDP and 2.4 million jobs (World Bank, 2023). In the state of California (United States), 1 in 9 jobs connects to port-related activity; in the state of Louisiana, the inland Port of South Louisiana ranks first in the country in terms of dry bulk cargo handled. In Barcelona (Spain), 15 000 people are employed in the blue economy, while in the region of Andalusia,the ocean economy accounts for around 10% of workers and 10.5% of GDP. However, given the range of differing definitions of the blue economy or ocean economy across countries, regions and cities, these estimates are challenging to compare – even within the same jurisdiction. For instance, the blue economy strategy of the city of Barcelona (Spain) highlights that estimates of the value of the blue economy are not comparable between the city, the region and the central government, as all three levels of government have different definitions of its scope. The blue economy also includes the ecosystem services or non-market benefits provided by freshwater, coastal and marine ecosystems (e.g. natural river systems, wetlands, mangroves and coral reefs), such as carbon storage, flood protection, food provision and cultural values. Globally, ecosystem services are worth 1.5 times total GDP (OECD, 2021). In the European Union, an average EUR 400 billion of ecosystem services are generated on a 10km coastal zone (European Commission, 2023). Coral ecosystems alone contribute an estimated USD 172 billion per year to the world economy with benefits such as food and raw materials, water purification, recreation and biodiversity (OECD, 2022). Mangroves across several Indonesian regions provide valuable ecosystem services (e.g., coastal protection, climate regulation, raw materials provision) that contribute to human wellbeing, providing on average USD 15 000 and 50 000 per hectare per year in benefits in Java and Bali respectively (WWF, 2022). Investing in natural assets such as mangroves and coral reefs can be beneficial for tourism as well as flood protection, carbon capture and biodiversity. For instance, investing USD 1 in mangrove conservation and restoration can generate a financial, environmental and health benefit of USD 3-17 over a 30-year period (Ocean Panel, 2020).The blue economy holds some of the keys to unlocking the energy transition. Water-based renewable energy (e.g. offshore wind power, floating solar panels or tidal energy) can power the clean energy transition; aquaculture solutions (e.g. oyster reefs) can mitigate coastal flood risks; and blue bioeconomy and biotechnology (e.g. seaweed farming) can capture carbon and nutrient pollution. The number of global ocean renewable energy inventions grew 7% annually on average between 2000 and 2019 (OECD, 2023). Offshore wind provided just 0.3% of global electricity supply in 2018, but it has the potential to generate more than 420 000 terawatt-hours per year worldwide, which represents 18 times current global electricity demand (OECD, 2022).However, the blue economy can be an important source of carbon emissions, pollution and other environmental stressors. Maritime transport alone accounted for almost 3% of global CO2 emissions in 2018, and pollution from shipping (e.g. noise, untreated sewage and oil spills) affects both freshwater and marine habitats and biodiversity. Moreover, ghost fishing gear contributes to around 10% of plastic pollution in the ocean (Greenpeace, 2019), and resource-intensive activities such as tourism and coastal development can be large water abstractors and waste generators. For example, coastal tourism in Greece leads to a 26% increase in plastic waste influx, contributing to the 11 500 tonnes of plastic leaking into the Mediterranean every year, 28% of which stems from sea-based sources such as ghost fishing equipment (WWF, 2019). An international review of water use in tourism suggested that direct water use in tourism varied between 80 to 2000 litres per tourist per day, depending on the geographic location and the type of hotel (Gössling et al., 2012), significantly above the average consumption of 124 litres per day in Europe (EurEau, 2021).Several blue economy strategies consider the importance of "greening" the blue economy (e.g. through decarbonisation or pollution mitigation) and preserving ocean and coastal ecosystems. For instance, Portugal's National Ocean Strategy (2021-20230) has 9 strategic goals including decarbonisation, supporting the country's efforts to achieve carbon neutrality by 2050 while improving the health of marine and coastal ecosystems. At subnational level, the state of Washington's (US) Maritime Blue Strategy (2022) aims to accelerate the decarbonisation of its maritime industry through technological innovations, infrastructure, and incentives to facilitate local, coastal, and international maritime operations (e.g. modernisation of state and regional ferries and shore-side infrastructure with cleaner low-carbon fuels). Similarly, the Port of Vigo's (Spain) Blue Growth Plan (2021-2027) has set a target to become a carbon sink by 2030 by increasing renewable energy use in port operations and business activities, using cleaner alternative fuels such as hydrogen on ships, and fostering seabed regeneration and CO2 sequestration through artificial reefs, for instance.Recognising the potential of the blue economy for sustainable economic development and the need to protect coastal and marine ecosystems, a growing number of international declarations and frameworks aim to boost its contribution to sustainable development agendas. Against the backdrop of the Paris Agreement on climate, the UN 2030 Agenda for Sustainable Development Goals (2015) and the UN Decade of Ocean Science for Sustainable Development (2021-2030), the blue economy discussion has seen:• Statements of intent making the blue economy a priority for sustainable economic development at global and regional levels, with the Nairobi Statement of Intent on Advancing the Global Sustainable Blue Economy (2018), the Jakarta Declaration on Blue Economy (2017) and the Communication on a new approach for a sustainable blue economy in the European Union (2021). • Guiding principles for a sustainable blue economy including the UN Sustainable Development Goals (SDG 14 – Life below water), UN Environment Programme Finance Initiative (UNEPFI) Sustainable Blue Economy Finance Principles and the Chennai High-Level Principles on Sustainable and Resilient Blue/Ocean-based Economy (2023) adopted by members of the G20. • International treaties aiming to protect the ocean from existing and emerging stressors, such as the ongoing meetings of the Intergovernmental Negotiating Committee established to develop an international legally binding instrument on plastic pollution, including in the marine environment (2022-2024), and the Treaty on the High Seas adopted by the UN General Assembly's Intergovernmental Conference on the conservation and sustainable use of marine biological diversity of areas beyond national jurisdiction (2023).• However, few of these national strategies, declarations and frameworks recognise subnational governments' crucial role in marine and freshwater conservation, water-related risk prevention and the blue economy. Recognising that subnational governments have a key but often underexploited role to play in unleashing the potential of a sustainable blue economy, the OECD programme on Cities and Regions for a Blue Economy aims to shed light on how a territorial approach to the blue economy can leverage place-based policies and subnational government competences to accelerate efforts towards sustainable blue economies.2. Water security as a condition for thriving blue economiesShedding light on the link between the blue economy and water securityClimate change magnifies water risks, which the OECD (n.d.) defines as "the risk of too much, too little, too polluted water and disruption to freshwater systems", by affecting the water cycle: more than 90% of natural disasters are related to water (UNEP, n.d.). Achieving water security means maintaining acceptable levels of these four water risks (OECD, 2013). Rooted in seas, coasts, rivers or lakes, blue economy sectors are particularly vulnerable to water-related risks in freshwater, coastal and marine environments, which are inextricably linked to one another. For instance, 72% of fish and invertebrate species representing 77% of total catch are estimated to be linked to river flows at some point in their life cycle (Broadley et al., 2022).Water risks can have severe economic impacts, especially in cities, which generate around 60% of GDP and employment in OECD countries. For example, a drought can cost up to 6% of GDP per annum by 2050 (World Bank, 2016), reduce a city's economic growth by up to 12% (Zaveri et al., 2021) and damage buildings and infrastructure due to the expansion and retraction of soils and land subsidence. Droughts, floods, and storms could wipe USD 5.6 trillion from global GDP between 2022 and 2050 (Aquanomics, 2023). "Too little" water can make rivers too shallow for fluvial transport or energy generation, with ripple effects beyond the blue economy. Shipping on the Rhine river was down 27% in 2018 due to low water levels, leading German industrial production to fall by 1.5%, and the production of chemicals and pharmaceuticals to drop by 10% for three months (OECD, 2023). Since mid-August, the persistent drought in the Panama Canal region has compelled authorities to impose traffic restrictions, resulting in a bottleneck of more than 100 large vessels transporting commodities thought to be worth billions of dollars (Earth.org, 2023). The Panama Canal anticipates a reduction of approximately USD 200 million in revenue during its upcoming fiscal year due to these crossing restrictions (Reuters, 2023).Floods, sea level rise and coastal erosion can disrupt marine and freshwater ecosystems while damaging waterfront infrastructure and assets such as ports and shipyards. With almost 11% of the global population living in Low Elevation Coastal Zones in 2020 (IPCC, 2022), sea level rise is projected to affect 800 million people living in one of the 570 cities exposed to sea level rise of at least 0.5 metre (C40 Cities, 2018). In the state of California (US), which has the largest ocean economy in the country valued at over USD 44 billion annually, USD 8-10 billion of existing property value is likely to be underwater by 2050, and an additional USD 6-10 billion to be at risk during high tides. In the San Francisco Bay Area alone, 104 000 existing jobs and the creation of 85 000 new jobs could be threatened by sea-level rise in the next 40-100 years (Ocean & Climate Platform, 2023).Water pollution from land-based sources can wreak havoc on both freshwater and marine ecosystems. Currently, about 60% of plastic marine debris is estimated to originate from urban centres, and around 80% of marine pollution comes from land-based sources such as untreated sewage (UNEP, 2021). The cost of water pollution exceeds billions of US dollars annually in OECD countries (OECD, 2017): for instance, in the US, the loss in lakefront property values due to nutrient pollution, which causes eutrophication and can trigger toxic algal blooms, has been estimated to cost between USD 300 million and USD 2.8 billion. Plastic pollution affects rivers and oceans alike: to date, 30 mega tonnes (Mt) of plastics have accumulated oceans, but more than triple that amount – 109 Mt – has piled up in rivers (OECD, 2022). Plastic pollution alone costs fisheries in the Gulf of Thailand USD 23 million per year (IUCN, 2020) and around EUR 13 million per year to the Scottish fishing industry (KIMO, 2010).Exacerbated by climate change, phenomena such as acidification, freshwater and marine heatwaves adversely impact fisheries, tourism and the ecosystem services provided by waterbodies (e.g. recreation, carbon capture and water purification). Marine heatwaves, whose frequency has doubled since the 1980s, can cause long-lasting or irreversible damage to many marine species, leading to mass mortality events and ultimately threating food security (OCP, 2023). Ocean warming and acidification cause damage to coral reefs (e.g. bleaching), which increases coastal flood risk and dampens reef-related tourism. In the state of Queensland (Australia), for example, the bleaching of the Great Barrier Reef could cause the loss of 1 million visitors to the region each year, equivalent to at least AUD 1 billion in tourism spending and 10 000 jobs (Australian Climate Council, 2017). In the state of Florida (US), coral reef degradation could increase the coastal flood risk to more than 7 300 people, costing an additional USD 823 million every year (Storlazzi et al., 2023).Water security in blue economy policyDespite the intrinsic link between water resilience and economic resilience, water security is generally a blind spot of national and subnational blue economy strategies, which tend to focus on boosting blue economy growth. Nevertheless, some blue economy strategies make the connection between the blue economy and water security. For instance, the US Blue Economy Strategic Plan (2021) piloted by the National Oceanic and Atmospheric Administration (NOAA) aims to increase the resilience of the country's coasts and oceans as well as the Great Lakes communities. The Blue Economy Vision for Scotland (2022) insists that the country's marine and inter-linked freshwater and coastal environments need to be sustainably managed, restored and resilient to climate change.Protecting and restoring the coastal and marine environment is considered in some strategies, but the resilience of coastal and marine environments and related economic activities is not often linked to freshwater resilience. This may be due to most blue economy strategies being led by government departments responsible for economic development or oceans, and freshwater and oceans often belonging to separate departments. Globally, government entities responsible for ocean health are often not the decision-makers or regulators of many of the activities that threaten its well-being in freshwater and on land (SIWI, 2020). The IPCC Special Report on the Ocean and Cryosphere in a Changing Climate (2019) highlights that water-related governance arrangements (e.g., marine protected areas, spatial plans and water management systems) are often too fragmented across administrative boundaries and sectors to provide integrated responses to the increasing and cascading risks from climate-related changes in the ocean and/or cryosphere. A counter-example is the Swedish Agency for Marine and Water Management, a newly created government entity responsible for protecting, restoring and ensuring the sustainable use of freshwater and marine resources, including fisheries management. Similarly, one of the departmental mandates of Fisheries and Oceans Canada is to protect oceans, freshwater and aquatic ecosystems through science, in collaboration with indigenous communities.3. The case for resilient, inclusive, sustainable and circular (RISC-proof) blue economies: a comprehensive frameworkThe blue economy has both a direct (e.g. pollution) and indirect (e.g. climate change) impact on freshwater, coastal and marine ecosystems. The literature reveals the dual dynamics at play. On the one hand, the blue economy is increasingly vulnerable to climate change, which mainly manifests through disruptions to the water cycle. This underscores the need for a blue economy that is resilient to climate change and inclusive of local communities adversely affected by water-related risks. On the other hand, as a potentially significant source of carbon emissions and pollution, blue economies should embrace sustainability by striking a balance between economic growth and environmental preservation while integrating circularity to minimise waste and promote resource efficiency.The OECD programme on Cities and Regions for a Blue Economy therefore suggests a framework encapsulating four dimensions that national and subnational governments ought to consider in the context of the blue economy: resilience, inclusiveness, sustainability and circularity (Figure 1). The Programme suggests that governments should aim for a blue economy that is:• Resilient to water-related risks exacerbated by climate change by using tools to ensure water security (e.g. disaster risk reduction, nature-based solutions, water pollution prevention, etc.). For example, in the French overseas archipelago of Guadeloupe, 400 companies in the fields of commerce, services and fishing experienced a combined revenue loss of nearly EUR 5 million in the first half of 2015 alone as a result of sargassum proliferation (CCI-IG, 2016). To tackle this issue, Guadeloupe joined the Sargassum Algae Cooperation Programme, which aims to strengthen the resilience of Caribbean territories by facilitating knowledge-sharing for sargassum management and valuation (e.g. to decontaminate agricultural soils loaded with pesticides).• Inclusive of local communities and stakeholders through engagement, employment opportunities in the blue economy and the protection of the most vulnerable (e.g. those living in informal settlements or sub-standard housing) from water risks. For example, the 2018 Maritime Strategy of Catalonia (Spain) prioritises community-led fishing management structures based on co-management, where each stakeholder interested in achieving sustainable fishing can participate with equal decision-making power and take on shared responsibilities in the co-management process. The strategy also aims to increase the share of women employed in fisheries and aquaculture, as they currently make up just 2.6% of the Catalan workforce in the sector. The Seine-Normandie Water Agency (France) organised Water Stakeholder Forums in 2022 to discuss the implementation of the Water Development and Management Plan (SDAGE) for 2022-2027 with around 900 local stakeholders. The Plan includes measures to protect and restore wetlands while limiting new coastal developments; collect and treat wastewater discharges from ports, boats, and campsites; and anticipate the need for drinking water in areas of demographic and tourist development to control water abstraction and prevent saline intrusion.• Sustainable environmentally, by limiting greenhouse gas emissions and pollution from blue economy sectors, sustainably managing coastal, marine and freshwater resources (e.g. fish and minerals) and conserving freshwater, coastal and marine ecosystems (e.g. wetlands). To promote sustainability, the Port of Seattle's (US) Smith Cove Blue Carbon Pilot Project is restoring underwater habitats and biodiversity, particularly with oysters, to sequester carbon, filter water and mitigate flood risk. In the port of Valencia (Spain), CO2 emissions dropped 30% between 2008 and 2019 despite activity growing 42%, due to initiatives such as fleet replacement with hybrid and electric vehicles, the adoption of cleaner fuels like liquid natural gas (LNG) and hydrogen, and the upgrade of lighting systems in port areas.• Circular, to foster resource efficiency and reduce waste, by using resources efficiently and keeping resources in use for as long as possible, preventing waste and transforming waste and/or by-products into resources. As part of a circular economy, the city of Rotterdam, Netherlands has created Blue City in 2019, a platform and accelerator for circular entrepreneurs that contribute to reducing waste and pollution by reusing existing products and materials. The nautical and naval industries of the region of New Aquitaine (France) and the state of Washington (US) carry out repair activities to maintain existing commercial and recreational vessels, thus keeping existing resources in use for as long as possible.To foster resilient, inclusive, sustainable and circular blue economies, the preliminary results of the OECD Programme on Cities and Regions for a Blue Economy point to three emerging priorities.First, better explore the role of subnational governments. Few of the mounting international declarations and agreements and national strategies related to oceans and the blue economy recognise the importance of a localised approach that leverages the role of place-based solutions, even though many of the most powerful tools for water security – land use, spatial planning, waste and water management – are in the hands of subnational governments. Cities and regions can also invest in infrastructure and nature-based solutions to mitigate flood risk and improve the resilience of local economies. They are also guardians of local culture and traditions linked to water-related economic activities, which can help ensure that solutions win the approval and active support of local communities. More broadly, cities and regions are crucial to achieving the SDGs: at least 105 of the 169 SDG targets will not be achieved without proper engagement and co-ordination with local and regional governments (OECD, 2020).Second, foster policy coherence across oceans, freshwater and land. Ocean and freshwater decision-making are often disconnected from one another, even though healthy oceans start with healthy freshwater. If freshwater and land do not have a seat at the ocean decision-making table, the ocean's main environmental stressors risk being overlooked. Similarly, coastal and inland cities cannot be disconnected from the basins they sit in. Basin organisations, which are set up by political authorities, or in response to stakeholder demands, deal with water resource management issues in river basins, lake basins, or across important aquifers. They can help cities and regions tackle the risks of "too much", "too little" and "too polluted" water and unlock the potential of the blue economy through engaging stakeholders across catchments, planning, coordination, data collection and monitoring.Third, create the right enabling environment. For a resilient, inclusive, sustainable and circular blue economy to thrive in cities and regions, technical solutions are not enough. Subnational governments need to find new funding mechanisms to support marine and freshwater protection; set sound incentives and frameworks to catalyse investments; develop partnerships with private actors, community organisations, cooperatives, think tanks and research institutes and stimulate blue entrepreneurship; create synergies across policies such as spatial planning, waste, energy, transport that affect the quantity and quality of water; and foster dialogue between scientists and policy makers, amongst others. These solutions are outlined in the Multi-Stakeholder Pledge on Localising the Blue Economy developed by the OECD in partnership with Atlantic Cities, International Association of Cities and Ports (AIVP), ICLEI - Local Governments for Sustainability, International Network of Basin Organisations (INBO), Ocean & Climate Platform, Resilient Cities Network, and United Cities and Local Governments Africa (UCLG-Africa).4. ConclusionThe blue economy is gaining traction as a means of combining economic growth with environmental protection, health and wellbeing. Considered as the sum of economic activities taking places in oceans, coasts, rivers and lakes, the blue economy can be a powerful driver of sustainable development in coastal and inland cities, regions and countries. However, the blue economy is both subject and a contributor to climate change, water risks and environmental degradation. This raises the need for a blue economy that is resilient to climate change; inclusive of local communities; sustainable, by balancing economic growth with environmental preservation; and circular, to minimise waste and promote resource efficiency. A review of the existing literature, including international declarations and agreements, national and subnational strategies related to the ocean and blue economy, reveals that water security and subnational governments are often absent from considerations. Further research may focus on:• Elucidating the link between freshwater and marine ecosystems and the blue economy;• Highlighting how the blue economy can both magnify water risks (e.g. through unsustainable fishing practices and coastal development) and mitigate them (e.g. through sustainable aquaculture and ecosystem-based approaches to coastal management);• Documenting how "territorialising" the blue economy, i.e. tailoring blue economy strategies and policies to local and regional needs, marine and freshwater ecosystems, cultural practices and economic priorities, can make measures more effective and integrated, with co-benefits for other policy areas (e.g. climate mitigation, climate adaptation and water security);• Better understanding roles and responsibilities across levels of government in managing ocean, coastal and freshwater resources based on institutional frameworks, capacities and priorities.Authors: Oriana Romano, Head of Unit, Water Governance, Blue and Circular Economy, OECD Centre for Entrepreneurship, SMEs, Regions and Cities (CFE)Juliette Lassman, Policy Analyst, Water Governance, Blue and Circular Economy, OECD Centre for Entrepreneurship, SMEs, Regions and Cities (CFE)Georges Laimé, Junior Policy Analyst, Water Governance, Blue and Circular Economy, OECD Centre for Entrepreneurship, SMEs, Regions and Cities (CFE)
This report presents a concise review of the major environmental and natural resources issues at the global and national level over the coming two decades. The environmental issues reviewed include air pollution and deterioration of air quality, greenhouse gas emissions and climate change, water quality, scarcity and access, land and soil degradation, deforestation and forest degradation, natural disaster, loss of biodiversity and protected areas, and governance and institutions for environmental and natural resource management. Besides providing an environment outlook, the report tackles the issue of monitoring also from the supply side. It identifies the relevant data and indicator sets available at the global level and country level to capture the global and locally relevant environmental issues with the underlying objective of pinpointing at data gaps. It concludes with a set of recommendations for moving forward on the monitoring agenda. Overall, the threats from climate change caused by Green House Gas (GHG) emissions, biodiversity loss, water pollution and scarcity as well as pressure on land as well as worsening ocean's state and biodiversity have to be taken under close observation in the period over the next 20 years. The environment challenges that the world faces are not trivial and some of them require immediate action. Action, in turn, requires reliable and accurate information. The second part of the report looks at information from the supply side. It identifies the relevant data and indicator sets available at the global level and country level to capture the global and locally relevant environmental issues with the underlying objective of informing and advising decision making and to identify the data gaps.
The Haiti Productive Land Use Systems (PLUS) Research Project continued and expanded the work of the Haiti Agroforestry project. It was intended to encourage Haitian farmers to plant trees as part of an overall plan by USAID to curb the devastating erosion which was washing the top soil into the sea. This project also investigated the effects on other crops as a result of tree planting. ; The Pinus genus is one of the most important sources of lumber in the world. It is represented in Haiti by P. occidentalis, a species that is endemic to the island of Hispaniola. The increasing demand for wood products, coupled with the deforestation of the pine forests in Haiti for agriculture, have seriously reduced the native populations of P. occidentalis. The ever increasing economic needs of peasants merit the testing of improved pine provenances that can offer greater value and be more efficiently managed in the current agroforestry systems of the high-elevation mountains. In 1989, 29 seed lots, representing 12 species of pine, were established in a species/provenance trial at Viard, near Kenscoff (alt. 1,500 m). A randomized complete block design was used with 3 replications. Survival, height and stem diameter measurements were recorded at 1, 2, 3 and 5 years after trial establishment. Merchantable volume was estimated at 7 years. Survival: Site survival, including all seed lots, was 80% after 5 years. Following a first year mortality of 10%, each additional year averaged an annual drop of 2.5%. The highest surviving species was P. taeda (90.3%), as compared to the lowest survivor, the P. occidentalis provenance from Cuba (62.7%). The only statistical difference detected at the species level was at the 3-year stage when P. taeda (91.9%) was shown to be superior to the Cuban P. occidentalis (67.0%). A large range of differences were observed among seed lots, though no statistical differences were detected by means comparison tests. The top three surviving seed lots were represented by P. taeda (94.7%, 93.3%, and 90.7%) compared to the lowest survival, 60.5%, exhibited by a P. caribaea hondurensis seed lot acquired from a commercial seed supplier. Average survival of the control (78.0%) was about the same as the overall site survival (79.6%) and approximately mid-ranked among all accessions tested. The control, a P. occidentalis seed lot from Séguin, Haiti, showed virtually no difference in survival from the other two seed lots originating in the Dominican Republic (both 76.7%). Height Growth: The overall mean height for the site, after 5 years, was 3.8 m. Growth rates during the initial 3 years averaged 0.5 m/yr overall, then jumped to 1.2 m/yr between 3 and 5 years. The P. occidentalis control grew an average 4.2 m (0.8 m/yr) - faster than the other two seed lots from the Dominican Republic (0.6 m/yr), though the means were not significantly different at the 95% probability level. P. oocarpa 15319 from Zimbabwe was the top performer, averaging 5.9 m over 5 years with an increment rate of 1.7 m/yr during the third and fourth year. It maintained its dominance throughout the measurement period. Three other seed lots exceeded an annual height growth rate of 1 m: P. patula 15275 and P. taeda 15169 from Zimbabwe and P. taeda 496 from SETROPA, a commercial seed company in Holland. These seed lots are superior to the local P. occidentalis in both growth rates and form. The slowest seed lot, P. caribaea caribaea 15/83 from Marbajitas, Cuba, averaged 1.8 m after 5 years. In general, the poorest performing seed lots were represented by P. caribaea caribaea, P. caribaea hondurensis, the P. occidentalis provenance from Cuba, and P. radiata. These species should be eliminated as candidates for agroforestry or reforestation at mid- to upper-elevation areas in Haiti. The P. taeda seed lots (496, 1003 and 15169) and P. elliottii 15441 exhibited a high degree of uniform growth, followed by P. oocarpa 15319. The most variable growth rates were exhibited by P. radiata, P. oocarpa 497, P. caribaea hondurensis 36/83, 19/85 and 17/85, P. elliottii 561. These seed lots are the same as those that showed poor adaptability. Diameter Growth: The overall site mean for DBH was 2.0 cm and 6.3 cm at 3 and 5 years, respectively. Differences were observed between height and stem diameter rankings among the pine seed lots. These differences reflect differences in taper form. The largest stem diameters (DBH) were achieved by P. taeda 496 (9.1 cm), P. oocarpa 15319 (8.8 cm) and P. caribaea bahamensis 3/80 (8.8 cm) after 5 years. This corresponds to a mean annual increment of 1.8 cm, as compared to 1.1 cm for the P. occidentalis control. The top seed lot for basal diameter, measured at a stump height of 0.1 m, was P. khasya 15212 (14.0 cm). The slowest diameter growths were exhibited by the seed lots that achieved the slowest height growth. Those species with seed lots below the mean annual growth rate of the control (1.1 cm/yr) included the following: the P. occidentalis provenance from Cuba (0.6 cm/yr), P. elliottii 651 (0.8 cm/yr), P. caribaea 9/76 and 15/83 (0.9 and 0.6 cm/yr, respectively), P. caribaea hondurensis 563 and 19/85 (0.7 and 1.0 cm/yr, respectively), P. occidentalis 38/77 and 66 (7293) (both 1.0 cm/yr), P. oocarpa 497 (0.8 cm/yr), and P. radiata 1008 (0.8 cm/yr). The 1.1 cm/yr rate of the 5-year old P. occidentalis in this trial should increase as the trees enter into the pole stage and selective thinning is conducted as recommended below. Merchantable Volume: The closely related species - P. patula, P. oocarpa, and P. tecunumanii - exhibited the highest yields of merchantable wood volume. The poorest performers at Kenscoff were P. caribaea caribaea, P. occidentalis, the P. occidentalis provenance from Cuba and P. elliottii. The difference between the top seed lot, P. patula 15275, and the P. occidentalis control is about a 3-fold difference. In addition to P. patula 15275, seven seed lots, representing 5 species, showed greater volume yield than the control, significant at the 95% probability level. Recommendations: (1) Eliminate the inferior seed lots from the Kenscoff trial. Selectively thin the promising seed lots, keeping the best trees, selected for form and size, for longer term study. Conduct selective thinning during the month of November and early December when the trial is most vulnerable to vandalism. Conduct the first phase of volume studies on the harvested trees for regression analyses. (2) Establish and distribute seed lots and provenances of known origin under similar growing conditions, particularly those with the greatest potential of making an economic impact among farmers: P. patula 15275, P. oocarpa 15319, P. tecunumanii 7/77, P. taeda 496 and P. caribaea bahamensis 3/80. Establish isolated stands for an in-country source of seed. Continue to distribute a balanced mix of P. occidentalis seed lots, harvested from trees selected for form and vigor from healthy populations in Haiti. Avoid collecting seed from the trial for extension purposes. The genetic quality of the seed harvested from a particular provenance or seed lot cannot be guaranteed because of the possibility of outcrossing. (3) Observe carefully any natural regeneration in the trials to confirm whether the imported pines can spread naturally. Observe any evidence of natural hybridization with P. occidentalis. (4) Study the social dimensions of the Kenscoff trial, especially encroachment problems and the use of the trial by neighboring peasants for cash cropping purposes. Develop suitable strategies to increase the security of the trial and establish control of land use. This has serious implications on the ability of government to address governance problems and encourage landowners to invest in alternative land use strategies that conserve natural resources. (5) Inform the Service des Ressources Forestière (MARNDR) of the uniqueness and importance of the Kenscoff trial and investigate the possibility for the SRF to collaborate with the Wynnes in managing and protecting the trial for future studies. The trial should be studied for long-term observations of pest and diseases, wood quality, natural regeneration, hybridization, tolerance to winds, form development and quantitative parameters of survival, height and stem diameters. ; Le genre Pinus est l'une des sources les plus importantes de bois dans le monde. Il est représenté en Haiti par P. occidentalis, une espèce endémique à l'île d'Hispaniola. La demande croissante pour les produits ligneux, ainsi que le défrichement des forêts de pins en Haiti pour l'agriculture, a séreusement réduit les populations natives de P. occidentalis. Les besoins économiques sans cesse croissants des paysans portent à tester des provenances améliorées de pins le systèmes agroforestiers en cours dans les montagnes de haute altitude. En 1989, 29 lots de semances, représentant 12 espèces de pins, ont été établis dans un essai espèce/provenance à Viard, près de Kenscoff (alt. 1.500 mètres). Le dessin expérimental utilisé était le bloc complètement au hasard avec 3 répétitions. Des données ont été recueillies sur la survivance, la hauteur et le diamètre de tige à 1, 2, et 5 ans après l'établissement de l'essai. Le volume marchand a été estimé à 7 ans. Survivance: Le taux de survivance, pour tous les lots de semences, était de 80% après 5 ans. Après une première année où le taux de mortalité était de 10%, une diminution moyenne de 2,5% chaque année, a été observée. L'espèce qui a donné le taux le plus élevé de survivance était le P. Taeda (90,3%), comparativement au Pinus sp. de Cuba, qui a accusé le taux le plus bas (62,7%). La seule différence statistique décelée au niveau de l'espèce était au stade de 3 ans quand le P. taeda (91,9%) s'est montré supérieur au Pinua sp. de Cuba (67,0%). De grandes différences ont été observées parmi les lot de semences, bien qu'aucune différence significative n'ait été détectée en analysant les lots séparément. Les trois meilleurs lots de semences au point de vue survivance, étaient représentés par P. taeda (94,7%, 93,3% et 90,7%), comparativement à ceux ayant le plus bas taux de survivance, 60,5%, accusé par un lot de P. hondurensis, obtenu d'un fournisseur commercial de semances au EUA. Le taux moyen de survivance du contrôle (78,0%) était à près le même que celui de tout le site 79,6%) et approximativement classé au milieu de tous les lots testés. Le contrôle, un P. occientalis en provenance de Seguin, Haiti, n'a virtuellement montré aucune différence de survivance avec les deux autres lots venant de la République Dominicaine (76,7% pour les duex). Croissance en hauteur: Le hauteur totale moyenne pour le site, après 5 ans, était de 3,8 m. Les taux de croissance pendant les 3 premières années furent de 0,5 m/an en moyenne pour tout le site, ensuite grimpèrent à 1,2 m/an entre 3 et 5 ans. Le contrôle P. occidentalis, grandit de 4,2 m (0,8 m/an) en moyenne - plus vite que les deux autres lots de la République Dominicaine (0,6 m/an), bien qu'il n'y ait pas de différence significative à 95% de probabilité. P. oocarpa 15319 de Zimbabwe était le plus performant, donnant en moyenne 5,9 m après 5 ans avec un taux d'ccroissement de 1,7 m/an pendant la troisième et la quatrième année. Il a maintenu sa domination pendant toute la période de mensurations. Trois autres lots de semences dépassa un taux de croissance annuel de 1 m; P. patula 15275 et P. taeda 15169 de Zimbabwe et P. taeda 469 de Setropa, une compagnie commerciale de semances établie en Hollande. Ces lots de semences sont supérieurs à ceux de l'espèce locale, P. occidentalis, tant pour les taux de croissance que pour la forme. Le lot de semences qui a manifesté la croissance la plus lente, P. Caribaea 15/83 de Marbajitas, Cuba, a donné une moyenne de 1,8 m après 5 années. En général, les lots de semences les moins performants furent représentés par P. Caribaea caribaea, P. Caribaea hondurensis, Pinus sp. de Cuba, et P. raidata. Ces espèces, généralement adaptées aux conditions de basse altitude, devraient être éliminées comme candidats pour l'agroforesterie ou le reboisement dans des zones de moyenne et de haute altitude en Haiti. Les lots de P. taeda (496, 1003 et 15169) et P. elliottii 15441 ont montré une plus grande uniformité de croissance, suivis de P. oocarpa 15319. Les taux de croissance les plus variables ont été ceux de P. radiata, P. oocarpa 497, P. caribaea hondurensis 36/83, 19/85 et 17/85, P. elliottii 561. Ces lots de semences sont les mêmes qui se sont montrés les moins adaptés. Croissance en diamètre: La moyenne de DHP pour tout le site était de 2,0 cm et 6,3 cm à3 et 5 ans, respectivement. Des différences de classement ont été observées pour la hauteur et le diamètre de tige parmi les lot de semences de pin. Elles reflètent des différences dans la forme de défilement. Les plus grands diamètres ont été atteints par P. taeda 496 (9,1 cm), P. oocarpa 15319 (8,8 cm) et P. caribaea bahamensis 3/80 (8,8 cm) après 5 ans. Ceci correspond à un accroissement annuel moyen de 1,8 cm, comparé à 1,1 cm pour le contrôle P. occidentalis. Le lot le plus performant pour le diamètre basal, mesuré à hauteur de souche de 0,1 m, était le P. khasya 15212 (14,0 cm). Les chiffres de croissance en diamètre les plus bas ont été accusés par les lots de semences qui ont montré la croissance en hauteur la plus lente. Ces espèces avec les lots de semences au-dessous du taux de croissance annuelle moyenne du contrôle (1,1 cm/an) comprennent: le Pinus sp. en provenance de Cuba (0,6 cm/an), P. elliottii 561 (0,8 cm/an), P. caribaea 9/76 et 15/83 (0,9 et 0,6 cm/an, respectivement), P. caribaea hondurensis 563 et 19/85 (0,7 et 1,0 cm/an, respectivement), P. occidentalis 38/77 et 66 (7293) (les deux 1,0 cm/an), P. oocarpa 497 (0,8 cm/an), et P. radiata 1008 (0,8 cm/an). Le taux de 1,1 cm/an du P. occidentalis âgé de 5 ans dans cet essai, devrait augmenter à mesure que les arbres entrent dans le stade de perchis et que l'éclairie sélective est pratiquée, comme recommandée ci-dessous. Volume marchand: Les espèces étroitement liées - P. patula, P. oocarpa, et P. tecunumanii - ont accusé les rendements les plus élevés de volume en bois marchand. Les moins performantes à Kenscoff furent P. caribaea caribaea, P. occidentalis, Pinus sp. de Cuba et P. elliottii. La différence entre le lot le plus performant, P. patula 15275, et le contrôle P. occidentalis, est d'environ 3 fois plus élevée. En plus du P. patula 15275, sept lots de semences, représentant 5 espèces, montrèrent un rendement en volume plus élevé que le contrôle, significatif à 95% de niveau de probabilité. Recommandations: (1) Eliminer les lots de semences inférieurs de l'essai de Kenscoff. Eclaircir sélectivement les lots prometteurs, en gardant les meilleurs arbres, sélectionnés pour leur forme et leur dimension, pour une étude à plus long terme. Pratiquer une éclaircie sélective pendant le mois de novembre et au début de décembre quand l'essai est le plus susceptible au vandalisme. Mener la première phase d'études de volume sur les arbres récoltés pour des analyses de régression. Eviter de collecter des semences de l'essai pour propagation, excepté pour la recherche. (2) Etablir et distribuer des lots de semences et provenances d'origine connue sous des conditions de croissance similaires, particulièrement ceux pouvant potentiellement avoir le plus d'impact économique sur les planteurs: P. patula 15275, P. oocarpa 15319, P. tecunumanii 7/77, P. taeda 496 et P. caribaea bahamensis 3/80. Etablir des peuplements isolés comme source de semences pour tout le pays. Continuer à distribuer un mélange balancé de lots de semences de P. occidentalis, récoltés d'arbres sélectionnés pour leur forme et leur vigueur, à partir de populations saines en Haiti. (3) Observer soigneusement toute régénération naturelle dans les essais pour confirmer si les pins importés peuvent se répandre naturellement. Observer tout signe d'hybridation naturelle avec le P. occidentalis. (4) Etudier les dimensions sociales de l'essai de Kenscoff, spécialement les problèmes d'incursions et l'utilisation de l'essai par les paysans avoisinants comme source de revenus. Développer des stratégies viables pour augmenter la sécurité de l'essai et établir un contrôle sur l'utilisation de la terre. Ceci a de sérieuses implications concernant la capacité du gouvernement à alternatives d'utilisation de la terre, qui conservent les ressources naturelles. (5) Informer le Service des Ressources Forestières (SRF du MARNDR) de l'aspect unique et de l'importance de l'essai de Kenscoff, et investiguer la possibilité pour le SRF de collaborer avec les Wynne dans la gestion et la protection de l'essai pour des études futures. L'essai devrait être étudié pour des observations à long terme sur les pestes et maladies, qualité de bois, régénération naturelle, hybridation naturelle, tolérance aux vents, développement de forme et paramètres quantitatifs de survivance, hauteur et diamètres de tige.
The objectives of the Costing Adaptation through Local Institutions (CALI) study were (a) to identify the costs of adaptation through local institutions, and (b) to investigate which institutions help households adapt to climate variability, which efforts and costs are needed to realize the adaptation options, and how they facilitate adaptation to climate variability. The study was carried out in Ethiopia, Mali, and Yemen. This report discusses the results for Yemen. In Yemen, village surveys were conducted in six villages and two expert workshops were organized to discuss the main framework of the study and to evaluate the draft results. The study assessed household vulnerability, analyzed the strategies households adopt to reduce the impacts of climate hazards, and evaluated the assistance households receive from different institutions. The analysis was based on household surveys, focus group discussions, and institutional stakeholder interviews. Vulnerability profiles, developed on the basis of field survey results, show that household vulnerability differs substantially between and within villages. The results show that the vulnerability and agro ecological potential in Yemen are related to rainfall, which is related to altitude. This study is a reflection of the insights that (a) poor, rural households are facing most of the climate variability- related hazards; (b) adaptation also has socioeconomic aspects; (c) understanding local adaptation processes is important for informing macro-policies; and (d) for prioritizing future adaptation, it is crucial to analyze historical adaptation strategies. The study involves an assessment of the adaptation options rural household pursue. The study also considers the differential access of various vulnerability groups, as well as the drivers for adopting particular strategies or constraints for not adopting other strategies. For this, households and institutional stakeholders were interviewed in six villages in Yemen, focus group discussions were organized, and experts were consulted.