Related by context. Frequent words. (Click for all words.) 74 global warming 66 climate change 63 Climate 63 Global Warming 55 melting glaciers 55 Warming 50 climate 50 Illegal immigration 50 Carbon dioxide 50 Renewable energy 50 greenhouse gasses 49 ocean acidification 49 melting ice 48 extinctions 48 warming 48 Deforestation 48 Natural disasters 48 greenhouse gases 47 Warm weather 47 atmospheric carbon dioxide 45 Climate Change 45 environmental degradation 45 overpopulation 45 Greenland ice 44 Polar bears 44 Climategate 44 mass extinction 44 Pollution 44 burning fossil fuels 44 fossil fuels 44 climatologists 43 Malnutrition 43 Skyrocketing 43 greenhouse emissions 43 obesity epidemic 42 Obesity 42 greenhouse gas 42 deforestation 42 Climate Change IPCC 42 Drought 42 alarmists 42 acid rain 42 greenhouse gas emissions 42 desertification 42 polar ice 42 environmentalism 42 climatic 42 oceans 42 crop yields 41 pollution 41 warmer temperatures 41 Glaciers 41 Severe weather 41 carbon emissions 41 Wet weather 41 glaciers 41 ozone layer 40 planet 40 La Nina 40 Arctic 40 air pollution 40 Environmentalists 40 Inaction 40 melting 40 Overcrowding 40 biodiversity 40 El Niño 40 fossil fuel 39 Warmer 39 Melting 39 Antarctica 39 Flooding 39 polar bears 39 arctic 39 Mental illness 39 manmade 39 Bottled water 39 coastal erosion 39 ecological 39 urbanization 39 Identity theft 39 tropics 39 Himalayan glaciers 39 Globalization 39 geoengineering 38 droughts 38 heat trapping gases 38 El Nino 38 Affordable housing 38 marine ecosystems 38 ecosystems 38 Swine flu 38 reducing carbon emissions 38 carbon dioxide emissions 38 Antarctic ice 38 Pachauri 38 Strong winds 38 Stem cell 38 Cell phones 38 CO2 38 warmer