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emissions 2469 Carbon dioxide 649 nitrogen 483 CO2 427 soil 407 water 404 climate change 318 pollution 282 Nitrous oxide 167 lead 156 global warming 141 ozone 135 environment 132 tropical 122 winter 117 life cycle 115 carbon sequestration 112 Sulfate 89 landfill 87 rice 87 hydrogen 85 ethanol 81 methane emissions 75 agriculture 68 power plants 56 carbon storage 52 |
Petroleum 47 radiation 46 waste management 45 grassland 45 corn 44 biofuels 44 carbon cycle 44 carbon balance 43 biodiesel 43 smoking 43 precipitation 42 crops 42 acidification 40 biodiversity 38 livestock 38 Mercury 36 wheat 30 biogas 30 lakes 28 Milk 21 ocean acidification 21 beef 16 food waste 12 Sugar 12 N2O emissions 12 |