Related by context. Frequent words. (Click for all words.) 59 atmospheric methane 56 atmospheric CO2 56 atmospheric concentrations 54 atmospheric carbon dioxide 54 atmospheric CO 53 CO2 concentrations 53 #.#C [004] 53 radiative forcing 52 hydrological cycle 52 radiocarbon 51 sunspot numbers 51 sunspot cycle 51 Brownian motion 50 interglacial period 49 Younger Dryas 49 glacial melting 49 ocean acidity 49 greenhouse warming 49 sunspot activity 48 stratospheric ozone 48 Carbon dioxide 48 species extinctions 48 Little Ice Age 48 climate alarmists 48 retreating glaciers 48 Tibetan Plateau 48 glacial melt 47 anthropogenic climate 47 decadal 46 melting glacier 46 Ocean acidification 46 greenhouse gas concentrations 46 anthropogenic 46 ozone depletion 46 journal Nature Geoscience 46 oxygen isotopes 46 icecap 45 gigatonnes 45 mass extinctions 45 interglacial 45 Greenland glaciers 45 journal Geology 45 ENSO 45 Greenland Ice 45 radiocarbon dating 45 Serreze 45 troposphere 45 Medieval Warm Period 45 marine sediments 44 stalagmite 44 Laffer Curve 44 atmospheric circulation 44 plate tectonics 44 radioactive decay 44 James Lovelock 44 E = mc2 44 Sulfur dioxide 44 aerosol particles 44 journal Geophysical Research 44 carbon dioxide 44 continental drift 44 Lindzen 44 lithosphere 44 explosive eruptions 44 glacial ice 44 El Nino warming 44 Greenhouse Gases 44 preindustrial 43 El Ninos 43 heat trapping greenhouse gas 43 CO2 43 glaciologists 43 ocean ridges 43 Pielke 43 glaciers melting 43 carbon dioxide CO2 43 NSIDC 43 Millennium Ecosystem Assessment 43 mid latitudes 43 nitrogen fixation 43 microfossils 43 lake sediments 43 climategate 43 glaciation 43 diatom 43 anthropogenic global warming 42 Nature Geoscience 42 sunspot 42 World Meteorological Organisation 42 Carbon dioxide emissions 42 diatoms 42 isotopic 42 CO ² 42 glacier melt 42 polar caps 42 volcanism 42 thermosphere 42 IPCC 42 Thomas Malthus 42 icecaps 42 terrestrial ecosystems