Drought: past problems and future scenarios
ch. 1. Introduction -- ch. 2. What is drought? -- ch. 3. The science of drought -- ch. 4. Quantifying drought -- ch. 5. Palaeo-drought : the occurrence of drought over past millennia -- ch. 6. Drought in the 20th century -- ch. 7. Major drought events of the 20th century -- ch. 8. Drought in the 21st century -- ch. 9. Summary and recommendations.