Related by context. Frequent words. (Click for all words.) 66 soil erosion 63 deforestation 63 environmental degradation 59 biodiversity 58 urbanization 57 climate change 56 coastal erosion 54 global warming 53 arable land 53 malnutrition 53 afforestation 52 semi arid 51 Agriculture Organization FAO 51 bio diversity 50 climatic 50 HIV AIDS pandemic 50 prolonged drought 50 Deforestation 49 arid 49 Agriculture Organisation 49 soil fertility 48 droughts 48 Sahel 48 salinity 48 malaria 47 FAO 47 water borne diseases 47 UNEP 47 Biodiversity 47 extinctions 46 Malnutrition 46 reforestation 46 melting glaciers 46 poverty alleviation 46 Agriculture Organisation FAO 45 forest fires 45 ocean acidification 45 sedimentation 45 industrialization 45 urban sprawl 45 AIDS pandemic 44 cropland 44 poverty eradication 44 HIV Aids 44 underdevelopment 44 grasslands 44 hydrological 44 natural calamities 44 glaciers 44 tropical forest 44 degradation 43 marginalization 43 pastoralists 43 tropical forests 43 extreme poverty 43 crop yields 43 Agriculture Organization 43 acid rain 43 ecosystems 43 subsidence 43 Amazon rainforest 43 hunger 43 ecological 42 famine 42 herders 42 epidemics 42 depletion 42 Global warming 42 HIV AIDS epidemic 42 Millennium Development Goals 42 MDGs 42 sandstorms 42 Drought 42 overpopulation 42 Environment Programme UNEP 42 river basin 42 Environment Programme 41 drought 41 forests 41 river basins 41 overfishing 41 deserts 41 erosion 41 scarcity 41 climatic conditions 41 pollution 41 herdsmen 40 floods 40 waterborne diseases 40 marine ecosystems 40 WMO 40 HIV AIDS 40 coral reefs 40 malnourishment 40 grassland 40 rainforests 40 atmospheric carbon dioxide 40 maternal mortality 40 poverty 40 mass extinction 39 insecurity