Related by context. Frequent words. (Click for all words.) 54 greenhouse warming 53 atmospheric CO2 51 Pielke 50 greenhouse gas concentrations 50 Greenhouse gases 49 Serreze 49 Carbon dioxide emissions 49 greenhouse gases 49 burning fossil fuels 48 ozone depletion 48 mid latitudes 47 atmospheric concentrations 47 greenhouse gasses 47 atmospheric carbon dioxide 45 tropical deforestation 45 milder winters 45 anthropogenic 45 global warming 45 heat trapping gases 45 Landsea 44 Meehl 44 carbon dioxide 44 Birol 43 Little Ice Age 43 chlorofluorocarbons 43 WMO 43 carbon dioxide emissions 43 atmospheric circulation 43 British Antarctic Survey 43 fossil fuels 43 Climatologist 43 acidification 43 CO2 42 greenhouse gas 42 ozone 42 greenhouse gas emissions 42 sunspot activity 42 greenhouse emissions 42 ozone depleting substances 42 Carlgren 42 climate change 42 heat trapping carbon dioxide 42 climatologist 42 warming gases 42 CFCs 42 Carbon dioxide 41 Trenberth 41 HCFCs 41 Jarraud 41 tropical cyclones 41 GHGs 41 Monbiot 41 phytoplankton 41 Amazon deforestation 40 WEO 40 Santer 40 heat trapping greenhouse gases 40 greenhouses gases 40 temperate regions 40 Aerosols 40 ozone layer 40 manmade global warming 40 carbon dioxide CO2 40 extinctions 40 particulate pollution 40 aerosols 40 HCFC 40 greenhouse gas emission reductions 40 nitrous oxide emissions 40 ocean acidification 40 Caldeira 40 C# emissions 40 mass extinctions 40 global warming gases 40 Global warming 40 mountain glaciers 40 Lautenbacher 40 emissions 40 warmer winters 40 carbon dioxide emission 39 Fossil fuels 39 heatwaves 39 subtropics 39 atmospheric chemistry 39 Overpeck 39 emission reductions 39 carbon emitted 39 oxygen depletion 39 carbon dioxide methane 39 carbon emissions 39 Oceanography Centre 39 gigatons 39 HFCs 39 atmospheric 39 industrialized countries 39 CO2 emissions 39 climatologists 39 IPCC 39 polar regions 39 carbon sinks 39 boreal