Related by context. Frequent words. (Click for all words.) 67 absorb carbon dioxide 62 carbon sinks 58 photosynthesis 55 carbon dioxide 53 nutrient rich 52 nitrogen 52 sequester carbon 51 atmospheric carbon dioxide 51 photosynthetic 51 transpiration 51 nutrients 50 carbon dioxide CO2 50 atmospheric CO2 50 phytoplankton 50 filter feeders 50 heat trapping carbon dioxide 49 nitrous oxide emissions 49 CO2 48 Co2 48 crop residues 48 nitrogen fixation 48 nutrient 47 greenhouse gases 47 Carbon Dioxide 47 pollinating 47 algal 47 CO2 concentrations 47 methane 47 oxidizes 46 absorb nutrients 46 ecosystems 46 Carbon dioxide 46 oceans 46 N2O 46 warming gases 46 greenhouse gasses 45 diatoms 45 pollinators 45 tropical forests 45 biodiversity 45 ocean ecosystems 45 metabolizing 45 microorganisms 45 stomata 44 aquatic ecosystems 44 greenhouse gas 44 hormone insulin 44 perennial grasses 44 nutrient pollution 44 sugars 44 aquatic organisms 44 Nutrients 44 metabolic processes 44 fungal spores 44 zooplankton 44 oxidant 43 water vapor 43 biosphere 43 biochemical reactions 43 harmful pollutants 43 peatlands 43 plankton 43 organisms 43 acidic 43 Planting trees 43 pollutants 43 evapotranspiration 43 naturally occurring bacteria 43 chlorophyll 43 pollutant 43 reducing carbon emissions 43 microscopic organisms 43 burning fossil fuels 43 digestive enzymes 43 harmful gases 43 gigatonnes 43 microbes 42 lignin 42 radiative 42 Carbon dioxide emissions 42 algae 42 conserving 42 tropical rainforests 42 livestock manure 42 Coral reefs 42 biomass 42 nitrogen phosphorus 42 intestinal bacteria 42 carbon dioxide methane 42 drylands 42 biochar 42 oxygen 42 bacteria fungi 42 dioxide 42 enzymes 42 naturally occurring substance 42 marine organisms 42 sebum 42 Nitrogen 42 insect populations 42 acidification