Related by context. Frequent words. (Click for all words.) 57 hydrological cycle 56 greenhouse warming 55 Snowball Earth 52 El Nino warming 52 icecaps 51 clathrates 51 glaciers melt 51 plankton blooms 51 ultra violet radiation 51 atmospheric methane 51 heliosheath 51 La Nina cooling 50 deglaciation 50 stratospheric ozone 50 ocean acidity 50 species extinctions 50 atmospheric CO2 50 WASP #b 50 acidification 49 radiative forcing 49 manmade greenhouse gases 49 magnetic reconnection 49 atmospheric CO 48 atmospheric carbon dioxide 48 glacial melting 48 anthropogenic climate 48 methane hydrates 48 polar caps 48 interglacial period 48 phytoplankton blooms 48 supernova explosion 48 CO2 concentrations 47 substorm 47 Solar flares 47 carbonic acid 47 glacial melt 47 Arctic Oscillation 47 atmospheric circulation 47 glaciations 47 meteorite impacts 47 Ultraviolet radiation 47 solar irradiance 47 Antarctic ozone 47 Ocean acidification 47 Earth ozone layer 47 warmer wetter 46 aerosol particles 46 Ozone layer 46 cryosphere 46 volcanism 46 perihelion 46 solar nebula 46 Hawking radiation 46 Pacific Decadal Oscillation 46 perturbations 46 atmospheric concentrations 46 Melting glaciers 45 deplete oxygen 45 oscillations 45 rebates fades 45 iron fertilization 45 biosphere 45 coronal hole 45 Gamma rays 45 geomagnetic storms 45 planetesimals 45 sunspot cycle 45 radiative 45 ocean acidification 45 planetary alignment 45 protoplanetary disk 45 hydrogen ions 45 cataclysmic 45 hydroxyl radicals 45 metastable 45 ocean ecosystems 45 Arctic permafrost 45 explosive eruptions 45 water vapor 45 La Nina phenomenon 45 polar vortex 45 terrestrial ecosystems 45 methane hydrate 44 By Sarah Trotto 44 geomagnetic storm 44 radioactive decay 44 ozone depletion 44 harmful ultraviolet radiation 44 biogeochemical 44 warming 44 mass extinction 44 mass extinctions 44 decoherence 44 mesosphere 44 By HARVEY SIMPSON 44 aurorae 44 accretion disk 44 glaciation 44 deflationary cycle 44 polar regions 44 solar corona