Related by context. Frequent words. (Click for all words.) 89 climate change 74 Global warming 72 Global Warming 68 greenhouse gases 65 greenhouse gas emissions 63 carbon emissions 63 Climate 62 greenhouse emissions 60 climate 60 carbon dioxide emissions 59 greenhouse gas 59 Climate Change 57 deforestation 57 warming 56 reducing carbon emissions 56 heat trapping gases 55 carbon emission 54 environmentalism 54 emissions 54 CO2 emissions 54 desertification 54 reduce carbon emissions 53 greenhouse gas emission 53 pollution 52 burning fossil fuels 52 Climate Change IPCC 52 fossil fuels 51 acid rain 51 Warming 50 GHG emissions 50 environmental degradation 50 melting ice 50 climatic 50 Pachauri 49 obesity epidemic 49 fossil fuel 49 carbon dioxide 49 air pollution 48 An Inconvenient Truth 48 CO2 48 overpopulation 48 carbon footprints 47 emission reduction 47 ozone layer 47 emission reductions 46 GHG 46 environmentalists 46 reduce greenhouse gas 46 oceans 46 polar ice 46 carbon sequestration 46 environmental 45 Al Gore 45 biodiversity 45 IPCC 45 biofuels 45 mercury emissions 44 environmentalist 44 childhood obesity 44 reducing greenhouse gas 44 overfishing 44 Kyoto Protocol 44 carbon offsets 44 planet 43 Gore 43 emission 43 carbon 43 Kyoto protocol 42 polar bears 42 polluter 42 Arctic 42 carbon footprint 42 glaciers 42 renewable energy 42 manmade 42 renewable energies 41 Intergovernmental Panel 41 Sierra Club 41 ecological 41 Emissions 41 carbon dioxide CO2 41 Copenhagen Accord 41 urban sprawl 41 polluters 40 alternative fuels 40 rainforests 40 forest fires 40 soil erosion 40 Pollution 40 terrorism 40 Inhofe 40 antibiotic resistance 40 smog 40 obesity 40 humankind 40 Renewable energy 40 Copenhagen 39 tropical forests 39 Environmentalists 39 biosphere 39 renewables