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soil 446 CO2 244 water 243 Carbon dioxide 201 emissions 186 nitrogen 173 climate change 119 carbon storage 79 tropical 70 Iron 54 grassland 54 precipitation 50 lead 49 environment 48 biodiversity 47 Nutrients 40 agriculture 40 Calcium 39 global warming 35 rice 35 carbon cycle 33 crops 29 carbon emissions 29 pollution 26 hydrogen 26 corn 24 |
Phosphorus 23 Minerals 22 carbon balance 21 carbon uptake 20 farming 20 forest ecosystems 19 wheat 18 wetlands 17 winter 17 ethanol 15 freshwater 15 radiation 15 Silica 14 global change 13 Magnesium 13 biofuels 12 topsoil 11 summer 11 life cycle 11 lipid peroxidation 11 sorghum 11 ozone 10 poultry 10 recycling 10 Food security 10 |