Related by context. Frequent words. (Click for all words.) 67 carbon sequestration 65 CO2 sequestration 58 Sequestration 58 Biochar 56 sequestering carbon 56 Geoengineering 55 Switchgrass 55 Organic farming 55 biochar 55 carbon dioxide sequestration 54 bioenergy 54 Cellulosic ethanol 53 livestock manure 53 crop residues 53 CO2 52 carbon capture 52 sequester carbon 52 carbon dioxide 52 agroforestry 51 biomass 51 corn stover 51 carbon dioxide CO2 51 nutrient runoff 51 methane hydrate 51 Gasification 50 Hydraulic fracturing 50 aquifer recharge 50 buffer strips 50 Renewable energy 50 EOR 50 woody biomass 50 biomass feedstock 50 sequestration 50 coal gasification 49 renewable feedstocks 49 biomass feedstocks 49 kerogen 49 Carbon dioxide 49 perennial grasses 49 GHG reductions 49 crop residue 49 Renewable fuels 49 biopesticides 48 abiotic 48 avoided deforestation 48 biofuel feedstock 48 Integrated Gasification Combined Cycle 48 methane 48 bioremediation 48 Bioethanol 47 biorefining 47 groundwater recharge 47 geoengineering 47 GHGs 47 biogenic 47 stover 47 conservation tillage 47 biofuels 47 Mulching 47 biocontrol 47 bioeconomy 47 nitrogen fixation 47 Carbon Dioxide 47 carbon sinks 47 seed germination 47 Greenhouse Gases 47 Miscanthus 47 salt tolerant 47 greenhouse gasses 46 agricultural residues 46 Spintronics 46 bioprospecting 46 environmentally benign 46 flue gases 46 Carbon Capture 46 greywater 46 Fossil Fuels 46 Fertilizing 46 anaerobic digestion 46 peatlands 46 switchgrass 46 isoprene 46 OTEC 46 Biomass 46 Genetically modified crops 46 nutrient loading 46 Biogas 45 anaerobic digesters 45 thermoelectric materials 45 Photosynthesis 45 environmentally sound 45 geological formations 45 methane hydrates 45 GHG 45 CO ² 45 plasma gasification 45 nitrogen fixing 45 desalinization 45 rotational grazing 45 CAES 45 nonpoint source pollution