Related by context. Frequent words. (Click for all words.) 64 gigatonnes 58 gigatons 54 megatonnes 53 SO2 emissions 53 terawatt hours TWh 52 greenhouse gases GHG 52 GHG reductions 52 kilotonnes 51 atmospheric carbon dioxide 51 nitrous oxides 51 carbon dioxide 51 GHGs 51 preindustrial levels 51 GWe 51 atmospheric CO2 51 greenhouse gas concentrations 50 terawatts 50 greenhouse gases GHGs 50 Carbon dioxide emissions 50 CO2 49 sulfur dioxide SO2 49 carbon dioxide CO2 49 Gt 49 radiative forcing 49 carbon dioxide emissions 49 CO ² 49 greenhouse gas emission reductions 48 greenhouse gases 48 terabecquerels 48 gigawatts GW 48 CO2 concentrations 48 cu meters 48 atmospheric concentrations 48 #Mt [001] 48 cu ft gas 48 greenhouse gas emissions 48 CO2 emitted 47 Greenhouse gases 47 #.#Mt [003] 47 atmospheric CO 47 #GW [002] 47 CO2e 47 carbon dioxide methane nitrous 47 GHG emissions 47 sulfur dioxide nitrogen oxide 47 sulfur dioxide emissions 47 largest emitter 47 Ann Intern Med 47 CO2 Emissions 47 atmospheric methane 46 #.#C [004] 46 Greenhouse Gas Emissions 46 strategic warheads 46 nitrous oxide emissions 46 By Julian Pecquet 46 heat trapping greenhouse gas 46 greenhouse gas 46 Million Tons 46 interglacial period 45 emissions 45 greenhouse emissions 45 particulate matter PM 45 CO2 emissions 45 GHG emission 45 greenhouses gases 45 gigawatts 45 Petabytes 45 terawatt hours 45 emission reductions 45 #.#m tonnes [002] 45 greenhouse gas GHG emissions 45 carbon dioxide emission 45 greenhouse gasses 45 CO -2 45 #Mt [002] 45 exabytes 45 TWh 45 pounds U#O# 45 tonnes 45 carbon emitted 45 Million Tonnes 45 co2 45 #.#Mt [002] 45 particulate matter emissions 45 degrees Fahrenheit warmer 45 #.# crores [003] 44 tonnes mt 44 metric tons 44 emit CO2 44 SO2 44 carbon dioxide CO2 emissions 44 NOx emissions 44 Greenhouse Gases 44 heat trapping carbon dioxide 44 gigawatt hours 44 carbon sinks 44 warming gases 44 carbon emissions 44 dmt 44 absorbing carbon dioxide 44 gigajoules