Related by context. Frequent words. (Click for all words.) 58 species extinctions 57 population densities 53 carbon dioxide concentrations 51 endemism 51 extinctions 50 hydrologic cycle 50 atmospheric CO2 49 atmospheric carbon dioxide 49 Extinctions 49 productivities 49 hydrological cycle 49 glaciers melt 49 greenhouse gas concentrations 49 reactive nitrogen 48 ocean acidity 48 CO2 concentrations 47 fossilize 47 atmospheric CO 47 nitrogen fixation 46 groundwater depletion 46 biodiversity 46 nitrogen deposition 46 atmospheric concentrations 46 terrestrial ecosystems 46 ecological degradation 46 Ocean acidification 46 2 MeV electron 46 primate evolution 46 saline aquifers 46 wetland ecosystems 45 Melting glaciers 45 freshwater ecosystems 45 atmospheric CO2 concentrations 45 Synthetic biology 45 wetter winters 45 Ultraviolet radiation 45 reproduce asexually 45 plankton blooms 45 fossilization 45 Evolutionary theory 45 subglacial 44 warmer wetter 44 warmings 44 urbanization 44 decarbonization 44 ultra violet radiation 44 salinization 44 bioaccumulation 44 potent greenhouse gas 44 acidify 44 tropospheric 44 ecosystems 44 arable farmland 44 deglaciation 44 bioactivity 44 genetic variability 44 Rapid urbanization 44 delicate ecosystems 44 planktonic 44 groundwater aquifers 44 urbanising 44 atmospheric methane 44 marine invertebrates 44 organismal 43 CO2 sequestration 43 ozone layer depletion 43 humans 43 unplanned urbanization 43 maternal morbidity 43 nitrification 43 glacial melting 43 severe droughts 43 interglacial period 43 primitive organisms 43 gyres 43 EDCs 43 Soil erosion 43 evolutionary adaptation 43 biosphere 43 drylands 43 soil salinity 43 glaciations 43 salination 43 temperate zones 43 depletion 43 preindustrial times 43 mortality 43 migratory bird populations 43 endocrine disruption 42 chytrid 42 mass extinctions 42 absorptive capacity 42 unequally distributed 42 Amitabh Chakraborty president 42 prolonged droughts 42 vaporise 42 deltaic 42 melting icecaps 42 glacial melt 42 herbivory 42 Demographic trends