Related by context. Frequent words. (Click for all words.) 65 atmospheric CO2 59 atmospheric carbon dioxide 56 global warming 56 greenhouse gas concentrations 53 acidification 53 greenhouse gasses 53 ozone depletion 52 extinctions 51 burning fossil fuels 51 climatic 51 biosphere 51 climate change 51 GHGs 50 volcanism 50 Little Ice Age 50 Global warming 50 mass extinctions 49 ocean acidification 49 greenhouse gases 48 atmospheric 48 carbon dioxide methane 47 aerosols 47 manmade 47 plate tectonics 47 mass extinction 47 oceanic 47 ecosystems 46 ocean currents 46 biodiversity 46 carbon sinks 46 deforestation 45 AGW 45 glaciers 45 speciation 45 Greenhouse gases 45 Urbanization 45 climatologists 45 melting glaciers 45 boreal 45 ecological 45 marine ecosystems 45 CO2 44 carbon dioxide 44 desertification 44 climatic conditions 44 environmental degradation 44 aquatic ecosystems 44 climatology 44 salinity 44 perturbations 44 phytoplankton 44 diatoms 44 Holocene 44 tectonic 44 coral bleaching 44 urbanization 44 biophysical 43 polar regions 43 Global Warming 43 pollutant 43 climate 43 upwelling 43 Greenland ice 43 overgrazing 43 sediments 43 fluxes 43 coastal ecosystems 43 water vapor 43 Deforestation 43 IPCC 43 volcanic eruptions 43 troposphere 43 fossil fuels 43 Carbon Dioxide 43 forest ecosystems 42 photosynthetic 42 Lomborg 42 GHG emissions 42 fossil fuel 42 warming 42 El Niño 42 paleo 42 Carbon dioxide 42 sedimentation 42 methane 42 species 42 ecology 42 carbon dioxide CO2 41 greenhouse gases emitted 41 siltation 41 GHG 41 El Nino 41 heat trapping gases 41 naturally occurring 41 pollutants 41 hydrological 41 greenhouse gas emissions 41 depletion 41 PETM 41 La Nina 41 greenhouse gas