Related by context. Frequent words. (Click for all words.) 59 global warming 58 greenhouse gasses 57 greenhouse warming 57 greenhouse gases 55 Ocean acidification 55 climate change 55 greenhouse gas concentrations 55 greenhouses gases 55 species extinctions 55 atmospheric CO2 54 Carbon dioxide emissions 54 glacial melt 53 glacier melt 53 atmospheric carbon dioxide 53 greenhouse gas emissions 53 CO2 emissions 53 carbon dioxide emissions 53 Global warming 53 atmospheric concentrations 52 carbon emissions 52 aerosol particles 52 manmade global warming 52 Greenhouse gases 52 anthropogenic 52 greenhouse emissions 52 CO2 concentrations 51 nitrous oxides 51 ozone depletion 51 carbon dioxide 50 CO2 50 Greenland ice 50 heat trapping carbon dioxide 49 emissions 49 gigatonnes 49 acidification 49 GHGs 49 anthropogenic global warming 49 Co2 49 nitrous oxide emissions 49 carbon dioxide methane 49 anthropogenic climate 49 warming gases 49 melting glaciers 49 mountain glaciers 48 melting polar 48 carbon dioxide CO2 48 water vapor 48 tropical deforestation 48 C# emissions 48 extinctions 48 greenhouse gas GHG emissions 48 burning fossil fuels 47 pollutions 47 reducing carbon emissions 47 melting permafrost 47 stratospheric ozone 47 mass extinctions 47 greenhouse gas 47 Global Warming 46 sunspot activity 46 Amazon deforestation 46 ocean acidification 46 pollution 46 Carbon Dioxide 46 carbon dioxide CO2 emissions 46 glaciers 46 GHG emission 46 fossil fuels 46 airborne pollutants 46 polar regions 46 fossil fuel 45 mercury pollution 45 Greenland Ice 45 heat trapping gases 45 Melting ice 45 Particulate matter 45 GHG emissions 45 subtropics 45 greenhouse gas emission reductions 45 ultrafine particles 45 NO2 45 Serreze 45 sulfur dioxide SO2 45 troposphere 45 Fossil fuels 45 particulate pollution 45 NOx emissions 45 icecap 45 GLOBAL WARMING 45 air pollution 44 CO2 emission 44 oxygen depletion 44 greenhouse gases emitted 44 atmospheric circulation 44 Worldwatch 44 carbon emitter 44 heatwaves 44 emission reductions 44 N2O 44 Medieval Warm Period 44 undernutrition