Related by context. Frequent words. (Click for all words.) 51 greenhouse gas concentrations 51 atmospheric CO2 51 gigawatts 50 degrees Celsius 50 atmospheric carbon dioxide 50 greenhouse gasses 49 carbon dioxide 49 CO2 49 greenhouse gases 48 degree Celsius 48 degrees Centigrade 48 #ppm [001] 48 exabytes 48 carbon dioxide emissions 47 C# emissions 47 greenhouse gas emissions 47 CO2 emissions 47 degrees Fahrenheit 46 carbon dioxide CO2 46 kilotons 46 greenhouse emissions 45 emission reductions 45 bcm 45 carbon dioxide emission 45 TWh 45 heat trapping gases 44 degrees centigrade 44 GHGs 44 carbon dioxide emitted 44 degree Fahrenheit 44 greenhouse gases emitted 44 emission reduction 44 emissions 44 tonnes 44 #GW [001] 43 carbon emissions 43 Kyoto Protocol expires 43 anthropogenic 43 methane 43 mbd 43 cubic meters 43 greenhouse gas emission 43 trillion cubic feet 43 carbon sinks 43 heat trapping greenhouse gases 43 GHG emissions 43 gigawatt hours 43 ° C 43 metric tons 42 greenhouse gas GHG emissions 42 burning fossil fuels 42 climate change 42 permafrost 42 #.#C [002] 42 glaciers 42 Greenland ice 42 carbon emission 42 ppm 42 tons 42 extinctions 42 degrees celsius 42 mass extinction 41 carbon dioxide methane 41 industrialized countries 41 UNFCCC 41 trillion cubic meters 41 APEC economies 41 Tcf 41 #.#GW [001] 41 ozone depletion 41 mass extinctions 41 PETM 41 reducing carbon emissions 41 Greenhouse gases 40 CO2 emission 40 Major Economies Forum 40 cubic yards 40 tcf 40 º C 40 Kyoto Protocol 40 floods droughts 40 earth crust 40 carbon dioxide CO2 emissions 40 heat trapping 40 mb d 40 megawatts MW 40 sq km 40 sulfur dioxide emissions 40 global warming 40 legally binding treaty 40 mln tonnes 40 magnitudes 40 greenhouse gas 40 mbpd 40 kiloton 39 degrees warmer 39 Copenhagen Accord 39 gigalitres 39 peat bogs 39 seismographs 39 peatlands