Related by context. Frequent words. (Click for all words.) 65 gigatonnes 58 gigatons 54 megatonnes 54 terawatts 53 Carbon dioxide emissions 53 atmospheric CO 53 CO ² 52 CO -2 52 carbon dioxide CO2 52 CO2 51 Industrialized nations 51 gigajoules 51 CO2 concentrations 50 atmospheric concentrations 50 carbon dioxide 50 atmospheric carbon dioxide 50 greenhouse gases GHG 49 co2 49 kilotonnes 49 GHG reductions 49 megatons 49 atmospheric methane 49 heat trapping carbon dioxide 49 CO2 Emissions 48 atmospheric CO2 48 ecological footprints 48 glacial retreat 48 preindustrial levels 48 tropical deforestation 48 species extinctions 48 terawatt hours TWh 48 ocean acidity 48 greenhouse gases 48 cu meters 48 Ecological Footprint 47 Gt 47 Antarctic ozone 47 carbon dioxide emissions 47 Co2 47 nitrous oxides 47 CO2 emissions 47 GWe 46 largest emitter 46 warming gases 46 fossil fuel 46 radiative forcing 46 #GW [002] 46 terrestrial ecosystems 46 industrialized countries 46 temperate forests 46 glacier melt 46 glacial melting 46 #.#GW [003] 46 preindustrial 46 greenhouse gases GHGs 46 CO2e 46 emit CO2 46 greenhouse gas emission reductions 46 #.#C [004] 46 Arctic permafrost 46 Nominal GDP 46 poleward 45 fossil fuels 45 Million Tonnes 45 SO2 emissions 45 glacial melt 45 greenhouse gas emissions 45 CO2 emitted 45 carbon emitter 45 Greenland Ice 45 methane hydrate 45 WEO 45 GHGs 45 Industrialised countries 45 eU#O# 45 greenhouse emissions 45 greenhouse gasses 44 Bcm 44 Rignot 44 Sales excluding autos 44 carbon emitted 44 #mt [001] 44 #bn cubic meters 44 greenhouse emission 44 Btus 44 glaciers melt 44 carbon emissions 44 greenhouse gas concentrations 44 tonnes mt 44 carbon dioxide emission 44 Ocean acidification 44 Resource Economics ABARE 44 nitrous oxide emissions 44 degrees Fahrenheit warmer 44 Gigawatts 44 Greenhouse Gases 44 #ppm [001] 44 Million Tons 44 bcf d 44 C# emissions 44 Greenland glaciers