Related by context. Frequent words. (Click for all words.) 73 desertification 60 Biodiversity 57 Urbanization 55 biodiversity 53 Deforestation 52 semi arid 52 bio diversity 51 deforestation 51 Drought 50 Malaria 50 floods droughts 50 Malnutrition 50 environmental degradation 50 Droughts 49 prolonged drought 49 arable land 49 soil erosion 49 climate change 49 Deserts 48 HIV AIDS pandemic 48 overgrazing 47 Climate Change 47 transboundary 47 Tuberculosis 47 arid 46 WMO 46 Climate 46 FAO 46 Indigenous Peoples 46 Millennium Development Goals 46 Global warming 45 MDGs 45 Genocide 45 Industrialization 45 Agriculture Organization FAO 45 extinctions 45 urbanization 45 coastal erosion 45 diarrheal diseases 45 Sahel 45 droughts 45 Colonialism 44 coral bleaching 44 Diseases 44 UNEP 44 Avian Influenza 44 Aral Sea 44 Global Warming 44 World Meteorological Organisation 44 malnutrition 44 Environment Programme UNEP 44 UNESCO 44 non communicable diseases 44 malaria 44 Agriculture Organisation 43 rapid urbanization 43 biodiversity conservation 43 HIV Aids 43 afforestation 43 global warming 43 Ramsar 43 marine biodiversity 43 Disaster Reduction 43 Millennium Declaration 43 droughts floods 43 Erosion 42 UN HABITAT 42 soil fertility 42 Disaster Risk Reduction 42 Environment Programme 42 tropical forests 42 Dengue 42 Crops 42 Famine 42 El Nino 42 Urbanisation 42 Sustainable Development 42 IFAD 42 Leprosy 41 Agriculture Organisation FAO 41 vector borne diseases 41 United Nations 41 El Niño 41 drought 41 Population 41 crop yields 41 ozone depletion 41 grasslands 41 forest ecosystems 41 Cholera 41 climatic 41 Health Organization WHO 41 poverty eradication 41 Biological Diversity 41 Biosphere Reserve 41 Unesco 41 Xenophobia 41 tropical forest 41 tropical diseases 41 Carbon Dioxide 41 Overfishing