Related by context. Frequent words. (Click for all words.) 61 environmental degradation 58 habitat fragmentation 57 climate change 56 species extinctions 56 global warming 55 Malthusian 55 ecological 55 overexploitation 54 habitat degradation 53 Global warming 52 overpopulation 51 Overpopulation 51 urbanization 51 ocean acidification 51 Ocean acidification 50 overhunting 50 ecologic 50 depletion 50 anthropogenic climate 50 biodiversity 49 ocean acidity 49 agrofuels 49 fossil fuel 49 rapid urbanization 49 anthropogenic 49 fossil fuels 49 scarcities 48 frequent droughts 48 melting polar 48 extinctions 47 aridity 47 freshwater ecosystems 47 monocultures 47 pollutions 47 melting glaciers 47 deforestation 47 eutrophication 47 overfishing 47 scarcity 46 floods droughts 46 environmental 46 Overfishing 45 Peak Oil 45 Invasive species 45 acidification 45 anthropogenic global warming 45 Urbanization 45 drylands 45 Global Warming 45 atmospheric CO2 45 environmental impacts 45 GLOBAL WARMING 45 greenhouse gasses 45 environmentalism 45 unsustainability 45 alarmists 45 impacts 44 desertification 44 tropical deforestation 44 Geoengineering 44 ecosystems 44 ecology 44 rapid industrialization 44 ecological catastrophe 44 Fossil Fuels 44 pollution 44 unsustainable 44 Worldwatch 44 enviromental 44 ocean ecosystems 44 mountain glaciers 43 societal 43 finite resource 43 Urban sprawl 43 manmade 43 EarthTalk 43 overgrazing 43 droughts 43 ozone depletion 43 terrestrial ecosystems 43 crop yields 43 overconsumption 43 glacial melt 43 monoculture 43 droughts floods 43 biosphere 43 atmospheric carbon dioxide 43 inevitable consequence 43 Monbiot 43 transboundary 43 manmade global warming 43 greenhouse emissions 43 gigatonnes 42 global warming alarmists 42 ecologies 42 destructiveness 42 Carbon dioxide emissions 42 urban sprawl 42 coastal ecosystems 42 greenhouse gases 42 predation