Related by context. Frequent words. (Click for all words.) 63 greenhouse warming 60 global warming 57 atmospheric CO2 56 greenhouse gas concentrations 55 ozone depletion 54 atmospheric carbon dioxide 53 extinctions 53 climate change 52 mass extinctions 51 warming 51 anthropogenic 50 burning fossil fuels 48 greenhouse gases 48 heat trapping gases 48 mass extinction 47 deforestation 47 greenhouse gasses 47 Little Ice Age 46 Global warming 46 acidification 46 climatological 46 polar regions 46 glaciation 45 floods droughts 45 volcanism 45 greenhouse gases emitted 45 humankind 44 Greenland ice 44 desertification 44 Global Warming 44 ocean acidification 44 gigatons 44 sunspots 44 greenhouse emissions 44 #.#C [002] 43 planet 43 alarmists 43 biosphere 43 climatic 43 degree Celsius 43 greenhouse gas emissions 43 atmospheric circulation 43 mankind 42 degree Fahrenheit 42 melting glaciers 42 Greenhouse gases 42 Earth 42 climatologists 42 catastrophic wildfires 42 albedo 41 heat trapping greenhouse gases 41 carbon dioxide 41 influenza pandemics 41 radioactive decay 41 climate 41 droughts 41 IPCC 41 carbon dioxide methane 41 Climate Change IPCC 41 planetary 41 volcanic eruptions 41 Tibetan Plateau 40 geoengineering 40 oceans 40 melting 40 ocean ecosystems 40 plate tectonics 40 GHGs 40 carbon dioxide emissions 40 environmental degradation 40 ozone layer 40 degrees Celsius 40 Climate 40 heat trapping emissions 40 heat trapping 40 humans 40 acid rain 40 warming gases 40 Desertification 40 mountain glaciers 40 Carbon Dioxide 40 coral bleaching 40 oxygen depletion 39 epidemics 39 soil erosion 39 fossil fuels 39 droughts floods 39 greenhouse gas GHG emissions 39 Antarctic ice 39 permafrost 39 Carbon dioxide emissions 39 carbon sinks 39 degrees Fahrenheit 39 methane 39 upwelling 39 AGW 39 greenhouse gas 39 atmospheric sciences 39 chlorofluorocarbons 38 warmer winters 38 carbon emissions