Related by context. Frequent words. (Click for all words.) 45 carbon dioxide emission 45 GHG emission 44 CO2 44 CO ² 44 aerosol particles 44 heat trapping carbon dioxide 43 carbon dioxide 43 atmospheric chemistry 43 Carbon dioxide emissions 43 radiative forcing 43 particulate emissions 42 gigatons 42 atmospheric CO 42 sequestering carbon 42 atmospheric carbon dioxide 42 SO2 emissions 42 carbon emitted 42 EPRI 42 emissions 41 greenhouse gases GHG 41 atmospheric CO2 41 sequester carbon 41 nitrous oxide emissions 41 greenhouse gas emissions 41 Computer simulations 41 nitrogen oxide emissions 41 carbon dioxide CO2 41 carbon dioxide emissions 41 journal Geophysical Research 41 gigatonnes 41 combustion 41 Amstrup 41 isoprene 41 species extinctions 41 carbon dioxide emitted 40 carbon dioxide sequestration 40 Carbon Dioxide 40 greenhouse gas emission reductions 40 CO2 concentrations 40 greenhouse gases 40 Greenhouse Gases 40 Pielke 39 carbon emissions 39 CO2 Emissions 39 unburned 39 greenhouse gas 39 preindustrial levels 39 CO2 emissions 39 calculate 39 Worldwatch 39 radiocarbon 39 sulfur dioxide SO2 39 estimating 39 emission 39 GHGs 39 gases emitted 39 oxygen isotopes 39 airborne pollutants 38 Research Institute EPRI 38 Co2 38 numerical simulations 38 CO2 sequestration 38 IHS CERA 38 carbon sequestration 38 atmospheric concentrations 38 GHG emissions 38 Trucost 38 journal Nature Geoscience 38 Air Conditioning Engineers 38 methane 38 Intergovernmental Panel 38 UN Intergovernmental Panel 38 particulate matter emissions 38 ocean acidity 38 extinctions 38 nitrous oxides 37 pollutant emissions 37 greenhouse gases emitted 37 sulfur dioxide nitrogen oxide 37 sulfur dioxide emissions 37 Concerned Scientists 37 greenhouse gasses 37 ozone depletion 37 Nature Geoscience 37 sulfur hexafluoride 37 Brattle Group 37 NF3 37 air toxics 37 greenhouse gas GHG emissions 37 Lindzen 37 greenhouse gas emission 37 emitting greenhouse gases 37 carbon 37 sulfur oxide 37 University Lamont Doherty 37 Greenhouse Gas 37 biomass 37 greenhouse emissions 37 mercury emissions 37 CO2 emitted 37 BTUs