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emissions 358 Nitrous oxide 195 nitrogen 166 soil 162 water 102 CO2 90 Nitrate 59 global warming 42 Carbon dioxide 35 rice 30 climate change 27 Nitrite 27 agriculture 26 wheat 24 winter 23 soil moisture 18 corn 17 landfill 17 irrigation 17 ozone 17 summer 17 livestock 17 pollution 17 grassland 15 crops 14 lead 14 |
tropical 13 environment 13 methane emissions 12 farming 11 flooding 11 stratospheric 11 Soybean 10 precipitation 10 Acetone 10 paddy fields 9 Phosphorus 9 ozone layer 9 ethanol 9 poultry 8 chicken 8 tundra 8 turkey 8 Legume 8 Petroleum 8 beef 8 Digestion 8 Clover 8 Calcium 8 freshwater 7 wetlands 7 |