Related by context. Frequent words. (Click for all words.) 63 N2O 60 nitrous oxide emissions 59 Nitrous oxide 58 methane 57 carbon dioxide 56 nitrous oxide 55 nitrogen 55 nitrous oxides 54 carbon dioxide CO2 54 CO ² 54 nitrogen fertilizers 53 Sulfur dioxide 53 isoprene 53 CO2 53 aerosol particles 53 Co2 52 sulphate 52 Carbon dioxide 52 pollutants emitted 52 absorbing carbon dioxide 52 pollutant 52 acidifying 51 sulfur hexafluoride 51 carbonic acid 51 heat trapping carbon dioxide 51 greenhouse gasses 50 greenhouse gases GHG 50 sulphates 50 nutrient runoff 50 Methane 50 sulfur dioxide 50 gases emitted 50 hydrological cycle 50 carbon sinks 50 greenhouse gas 50 sulfur dioxide SO2 50 atmospheric CO2 50 atmospheric carbon dioxide 49 water vapor 49 greenhouse gases 49 SO2 emissions 49 pollutants 48 sulfur oxide 48 alkali 48 oxidant 48 nitrogen oxide 48 atmospheric CO 48 aldehydes 48 sulfate 48 Sulfate 48 formic acid 48 acrolein 48 CO2 concentrations 48 unsaturated fatty acids 48 Atrazine 48 Ocean acidification 47 soot particles 47 nitrogen fixing 47 ocean acidity 47 heat trapping 47 incomplete combustion 47 nutrient 47 SO2 47 dioxide 47 Anhydrous ammonia 47 algal 47 oxidizes 47 denitrification 47 nitrogen oxides 47 nitrate 47 furans 47 gases 47 bile acids 47 fine particulates 47 sulfur oxides 47 stratospheric ozone 46 nitric oxide NO 46 Particulate matter 46 gastric acid 46 gasses 46 oxalic acid 46 microscopic algae 46 particulate emissions 46 ozone 46 nitric oxide 46 organic acids 46 Carbon Dioxide 46 hydrogen cyanide 46 particulates 46 Switchgrass 46 terrestrial ecosystems 46 ozone smog 46 sequestering carbon 46 Biochar 46 reactive oxygen species ROS 46 absorb carbon dioxide 46 peatland 46 biodegrades 46 NF3 45 peatlands 45 GHGs