Related by context. Frequent words. (Click for all words.) 64 greenhouse warming 62 atmospheric CO2 60 glacial melt 59 anthropogenic 59 anthropogenic climate 58 greenhouse gas concentrations 58 atmospheric carbon dioxide 57 species extinctions 56 CO2 concentrations 56 ozone depletion 55 atmospheric concentrations 54 sunspot activity 53 gigatonnes 53 manmade global warming 52 anthropogenic global warming 52 albedo 52 global warming 51 mountain glaciers 51 greenhouse gasses 50 atmospheric circulation 50 extinctions 50 Greenhouse gases 49 GHGs 49 greenhouse gases 49 global warming alarmists 49 polar caps 49 Medieval Warm Period 49 ocean acidification 49 Little Ice Age 49 Global warming 49 acidification 49 temperate regions 48 airborne pollutants 48 Carbon dioxide emissions 48 Serreze 48 nitrous oxide emissions 48 temperate zones 48 El Ninos 48 landmasses 48 mass extinctions 47 water vapor 47 radiative 47 melting glaciers 47 earths 47 CO2 46 polar regions 46 glaciers 46 bee populations 46 deforestation 46 gigatons 46 aerosols 46 drylands 46 Co2 46 biota 45 Landsea 45 pollutants 45 chlorofluorocarbons 45 burning fossil fuels 45 precipitation 45 subtropics 45 fossil fuels 45 aridity 45 eutrophication 45 carbon dioxide CO2 45 ozone depleting substances 45 Pielke 45 overgrazing 44 salinity 44 greenhouses gases 44 glaciation 44 groundwater pumping 44 decadal 44 humans 44 megafauna 44 pollutant 44 acid rain 44 tropical deforestation 44 crop yields 44 carbon dioxide 44 volcanism 44 overexploitation 44 carbon dioxide methane 44 Greenland ice 44 climate change 44 protective ozone layer 43 GHG emissions 43 Sulfur dioxide 43 fossil fuel 43 polar ice 43 nitrogen oxides NOx 43 manmade 43 greenhouse emissions 43 habitat degradation 43 Amazon deforestation 43 meltwater 43 arid regions 43 Tibetan Plateau 43 biosphere 43 Carbon dioxide 43 greenhouse gas emissions 43 ocean ecosystems