Related by context. Frequent words. (Click for all words.) 57 burning fossil fuels 57 greenhouse warming 56 greenhouse gases 55 greenhouse gas concentrations 54 Greenhouse gases 54 atmospheric carbon dioxide 52 greenhouse gasses 52 atmospheric concentrations 51 carbon dioxide methane 51 anthropogenic climate 51 global warming 50 carbon dioxide 50 heat trapping 49 Ocean acidification 49 CO2 concentrations 49 species extinctions 49 manmade global warming 49 atmospheric CO2 49 anthropogenic 49 equatorial regions 48 heat trapping carbon dioxide 48 subtropical regions 48 mountain glaciers 48 Carbon dioxide 48 ozone depletion 48 anthropogenic global warming 48 heat trapping greenhouse gases 48 nitrous oxides 47 mass extinctions 47 methane 47 Carbon dioxide emissions 47 pollutant 47 heat trapping gases 47 Medieval Warm Period 47 Global warming 47 subtropics 47 sunspot activity 47 El Ninos 47 heatwaves 47 glacial melt 46 temperate zones 46 Secondhand smoke 46 GHGs 46 Cigarette smoking 46 greenhouse gas emissions 46 Sulfur dioxide 46 greenhouse gas 46 aerosol particles 46 stratospheric ozone 46 particulate pollution 46 gigatonnes 46 greenhouses gases 46 water vapor 45 mid latitudes 45 polar regions 45 Little Ice Age 45 carbon dioxide emissions 45 quark gluon plasma 45 airborne pollutants 45 Climatologists 45 Fossil fuels 45 climate change 44 carbon dioxide CO2 44 secondhand smoke 44 antioxidant supplements 44 ultraviolet radiation 44 acidification 44 volcanic activity 44 incomplete combustion 44 Lindzen 44 Greenland glaciers 44 warming gases 44 global warming alarmists 44 methyl mercury 44 nitrous oxide emissions 44 greenhouse gases emitted 43 Fructose 43 chlorofluorocarbons 43 fructose corn syrup 43 air pollution 43 polycyclic aromatic hydrocarbons 43 rocky planets 43 temperate regions 43 cardiovascular mortality 43 greenhouse emissions 43 Carbon monoxide poisoning 43 fossil fuels 43 Pielke 43 methane hydrates 43 Particulate matter 43 pollutants 43 milder winters 43 mass extinction 42 Serreze 42 volcanism 42 El Nino 42 La Nina 42 undernutrition 42 CO2 42 Droughts 42 chlorofluorocarbons CFCs