Related by context. Frequent words. (Click for all words.) 65 carbon dioxide 63 CO2 62 carbon dioxide CO2 60 greenhouse gases 59 greenhouse gasses 59 Carbon dioxide 58 extinctions 57 Greenland ice 57 water vapor 56 phytoplankton 56 ocean acidification 55 heat trapping gases 55 glaciers 54 oceans 54 carbon dioxide emissions 54 global warming 54 salinity 54 greenhouse gas emissions 53 greenhouse gas 53 greenhouse emissions 53 mass extinction 53 polar regions 53 photosynthesis 53 biosphere 52 methane 52 marine ecosystems 52 biodiversity 51 Antarctic ice 51 melting glaciers 51 permafrost 50 sediments 50 deforestation 50 sediment 50 atmospheric 50 climate change 50 nitrogen 49 CO2 emissions 49 polar ice 49 volcanic activity 49 aerosols 49 carbon emissions 48 sulfate 48 fossil fuels 48 GHG emissions 48 chlorophyll 48 burning fossil fuels 48 emissions 47 carbon sequestration 47 latitudes 47 ozone 47 cosmic rays 47 ozone layer 47 tropical forests 47 Global warming 47 pollutant 47 plankton 47 climatologists 46 sunspots 46 pollutants 46 carbon 46 warming 46 ecosystems 46 mercury 46 methylation 46 Deforestation 46 coral reefs 45 mercury pollution 45 carbon emission 45 ocean currents 45 fossil 45 sedimentation 45 organic compounds 45 fossil fuel 45 melting ice 44 volcanic eruptions 44 snowpack 44 climatic 44 organic molecules 44 gases 44 phosphorus 44 oscillations 44 neutrons 44 supernovae 44 nutrient 44 greenhouse gas emission 44 crop yields 44 mercury emissions 44 Arctic Ocean 44 vertebrates 44 soils 44 degree Fahrenheit 43 organisms 43 nitrate 43 corals 43 Climate Change IPCC 43 species 43 ppm 43 oceanic 43 IPCC 43 lipids 43 emission reductions