Related by context. Frequent words. (Click for all words.) 64 emissions 63 carbon dioxide emissions 63 greenhouse gasses 63 greenhouse emissions 63 greenhouse gas emissions 63 greenhouse gases 61 GHGs 61 CO2 emissions 61 greenhouse gas 60 carbon dioxide 60 GHG emissions 60 CO2 60 nitrogen oxide emissions 59 carbon emissions 58 nitrogen oxides 58 nitrogen oxide 58 greenhouse gas GHG emissions 58 sulfur dioxide emissions 58 carbon dioxide CO2 57 nitrogen 57 greenhouse gas emission 56 Emissions 56 carbon emission 56 NOx 55 methane 55 emission 54 carbon dioxide emission 54 GHG 54 CO2 emission 53 pollutants 53 pollution 53 carbon dioxide CO2 emissions 52 carbon sequestration 52 emission reductions 52 exhaust emissions 52 air pollution 51 particulate matter 51 pollutant 51 atmospheric carbon dioxide 50 tailpipe emissions 50 reduce carbon emissions 50 tillage 49 mercury emissions 49 heat trapping gases 49 reducing CO2 emissions 49 biofuel 49 carbon footprint 49 Greenhouse Gas 48 emission reduction 48 biomass 48 Carbon dioxide 47 reducing carbon emissions 47 corn ethanol 47 burning fossil fuels 47 carbon 47 particulates 47 carbon sinks 47 phosphorus 47 heat trapping greenhouse gases 47 Nitrogen 47 global warming gases 46 sulfur dioxide 46 crop yields 46 ozone depletion 46 combustion 46 biofuels 46 biofuel crops 46 ozone 46 ozone pollution 45 mercury pollution 45 volatile organic compounds 45 phosphorous 45 Emission 45 soil erosion 45 acid rain 45 nitrogen dioxide 44 manure 44 VOCs 44 nitrogen fertilizer 44 fossil fuel 44 SO2 44 water vapor 44 carbon footprints 44 Methane 44 anthropogenic 43 salinity 43 fossil fuels 43 ecological footprint 43 sewage sludge 43 ethanol 43 poultry litter 43 environmental impacts 43 polluting 42 corn acreage 42 particulate 42 bioenergy 42 nitrate 42 soot 42 bio fuels 42 biosolids 42 gases