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(Click for frequent words.) 83 atmospheric CO2 75 CO2 concentrations 73 carbon dioxide concentrations 72 atmospheric CO 72 greenhouse gas concentrations 69 atmospheric methane 69 atmospheric CO2 concentration 66 atmospheric CO2 levels 66 atmospheric CO2 concentrations 66 atmospheric concentrations 65 carbon dioxide 65 ocean acidity 65 greenhouse warming 64 species extinctions 63 CO2 62 carbon dioxide CO2 62 anthropogenic emissions 61 GHG concentrations 60 ppmv 60 greenhouse gases 60 Palaeocene Eocene Thermal Maximum 60 stratospheric ozone 59 albedo 59 terrestrial ecosystems 59 carbon sinks 59 hydrological cycle 59 greenhouse gasses 59 anthropogenic 59 climate modellers 59 Carbon dioxide 59 acidification 58 sunspot activity 58 deglaciation 58 Atmospheric CO2 58 extinctions 58 anthropogenic carbon dioxide 58 reactive nitrogen 58 anthropogenic CO2 emissions 58 ozone depletion 57 mass extinctions 57 Greenland ice 57 anthropogenic greenhouse gas 57 glacial melting 57 gigatonnes 57 water vapor 57 radiative forcing 57 CO ² 57 Greenland icesheet 57 atmospheric circulation 56 sulphate aerosols 56 phytoplankton 56 Zeebe 56 hydrologic cycle 56 ocean acidification 56 Younger Dryas 56 volcanism 56 nitrogen fixation 56 solar irradiance 56 anthropogenic climate 56 N2O emissions 56 Kharecha 56 climatic variability 56 interglacial period 55 aerosol particles 55 heat trapping gases 55 coccolithophores 55 anthropogenic CO2 55 Eemian 55 sulfate aerosols 55 tropospheric ozone 55 anthropogenic greenhouse gases 55 atmospheric aerosols 55 glaciers 55 mammal extinctions 55 thermal inertia 54 atmospheric ozone 54 warmings 54 oceans 54 Keeling Curve 54 oxidized mercury 54 GtC 54 Greenhouse gases 54 Permian extinction 54 glaciation 54 carbon dioxide emissions 54 glacial melt 54 cosmic ray flux 54 phosphorus concentrations 54 global warming 54 glacial interglacial 54 salinity 54 manmade greenhouse gases 54 paleoclimatic 54 Little Ice Age 54 glacial retreat 54 greenhouse gas emissions 54 planetary warming 54 potent greenhouse gas 54 heat trapping carbon dioxide 54 ppbv 54 photosynthetic organisms 53 CO -2 53 carbonate minerals 53 Greenhouse gasses 53 nitrogen deposition 53 polar caps 53 glacial interglacial cycles 53 greenhouse gas 53 plankton blooms 53 interglacial 53 ppm CO2 53 greenhouse emissions 53 Co2 53 mass extinction 53 mid latitudes 53 marine phytoplankton 53 polar regions 53 Carbon dioxide emissions 53 climate modelers 53 Earth biosphere 53 manmade CO2 emissions 53 photosynthesis 53 oceanic circulation 53 forcings 53 methane CH4 53 icesheets 53 interglacial periods 53 Appy Sluijs 53 radiocarbon 53 biosphere 52 Rignot 52 nitrification 52 Medieval Warm Period 52 gaseous pollutants 52 Paleocene Eocene Thermal Maximum 52 atmospheric nitrogen 52 nitrous oxide N2O 52 marine sediments 52 phytoplankton blooms 52 Ocean acidification 52 diatoms 52 isoprene 52 Antarctic ozone 52 poleward 52 GHGs 52 N2O 52 evapotranspiration 52 methane 52 tropical deforestation 52 Cryogenian 52 glaciations 52 aerosol concentrations 52 marine ecosystems 52 biodiversity 52 Ordovician extinction 52 oVOCs 52 Carbon Dioxide 52 glacier shrinkage 52 sequestering CO2 51 anthropogenic warming 51 methanogenesis 51 Carbon dioxide CO2 51 phytoplankton biomass 51 axial tilt 51 Gigatonnes 51 Antarctic ice 51 absorbing carbon dioxide 51 melting glaciers 51 mountain glaciers 51 multi decadal 51 absorb carbon dioxide 51 nitrous oxide emissions 51 Trichodesmium 51 terrestrial biosphere 51 SO2 emissions 51 sulfate aerosol 51 photosynthetic 51 RBP4 51 atmospheric chemistry 51 CO -2 emissions 51 ocean ecosystems 51 Snowball Earth 51 Rossby waves 51 paleoclimate 51 meltwater 51 clathrates 51 meteorite bombardment 51 substorm 51 preindustrial levels 51 permafrost 51 meteorite impacts 51 ozone depleting gases 51 ° C warmer 50 cosmic ray intensity 50 acidifying 50 sediments 50 Anthropogenic 50 deforestation 50 ghg emissions 50 Rubisco 50 ozone layer depletion 50 icecaps 50 thermohaline circulation 50 anthropogenic CO 50 surface temperatures SSTs 50 sediment 50 diatom 50 gigatons 50 alpine glaciers 50 megafauna 50 atmospheric 50 troposphere 50 retreating glaciers 50 gigatonne 50 2oC 50 climate change 50 nitrogen 50 Ice Ages 50 plate tectonics 50 Greenland Ice 50 seawater pH 50 glaciers melt 50 warm interglacial 50 climate forcings 50 C# atmospheric concentrations 50 polar icecap 50 mantle convection 50 KT boundary 50 absorbs carbon dioxide 50 Laurentide ice sheet 50 chlorine monoxide 50 Stratospheric ozone 50 nitrogen oxides emitted 50 greenhouse gas nitrous oxide 49 Amundsen Sea 49 upper troposphere 49 Phytoplankton 49 Species extinction 49 Le Quéré 49 carbondioxide 49 permafrost degradation 49 carbonate ion 49 seafloor sediments 49 auxin 49 CO2 emissions 49 polar ice 49 C4 grasses 49 volcanic activity 49 aerosols 49 Antarctic glaciers 49 mantle plumes 49 cryosphere 49 decadal 49 Greenland glaciers 49 carbon dioxide CO2 emissions 49 Ken Caldeira 49 deep convective clouds 49 atmospheric ozone layer 49 galactic cosmic rays 49 sunspot cycle 49 oxygen isotopes 49 springtime ozone 49 midlatitudes 49 carbon emissions 49 Paleoclimate 49 iron fertilization 49 Anthropocene 49 melting permafrost 49 Medieval Warm Period MWP 49 ozone O3 49 biogeochemical cycles 49 Great Oxidation Event 49 subglacial lakes 49 amphibian declines 49 harmful ultraviolet UV radiation 49 Ozone depletion 49 coolings 49 2C #.#F 49 freshwater ecosystems 49 permafrost melts 49 Last Glacial Maximum 49 Milankovitch cycles 49 acidic oceans 49 tropospheric 49 stratospheric ozone depletion 49 icecap 49 teleconnections 49 teragrams 49 nutrient loading 49 chloride concentrations 49 subglacial 49 earths 49 Prochlorococcus 49 phytoplankton populations 49 magma ocean 48 paleoclimatology 48 cryovolcanism 48 sulfate 48 runaway greenhouse 48 fossil fuels 48 GHG emissions 48 Otto Bliesner 48 Younger Dryas cold 48 dinosaur extinction 48 chlorophyll 48 biogeochemical processes 48 climate alarmists 48 thermosphere 48 permafrost thaws 48 tropopause 48 acidifying oceans 48 sediments deposited 48 climatic variations 48 Alpine glaciers 48 trophic levels 48 Cambrian explosion 48 Aiguo Dai 48 Stefan Rahmstorf 48 Rahmstorf 48 icesheet 48 sulfur isotope 48 Corinne Le Quere 48 solar nebula 48 hydroxyl radical 48 lithosphere 48 ecoregions 48 Nitrogen oxide emissions 48 glaciers melted 48 paleomagnetic 48 greenhouses gases 48 Behrenfeld 48 Eric Rignot 48 oxygen isotope 48 noble gases 48 oceanic currents 48 Kilimanjaro glaciers 48 #ppm CO2 48 volcanic plumes 48 forams 48 ozone depleting chemicals 48 burning fossil fuels 48 total solar irradiance 48 heat trapping greenhouse gas 48 lake sediments 48 sulphate particles 48 degrees Celsius above preindustrial 48 geological timescales 48 salinities 48 emissions 48 Warmer seas 48 #.#oC [001] 48 photosynthetic apparatus 48 greenhouse gases GHGs 48 anthropogenically 48 preindustrial times 48 Jakobshavn 47 magnetic substorms 47 polyamines 47 subsurface ocean 47 substorms 47 amplifying feedbacks 47 tropical troposphere 47 Acidification 47 methane burps 47 geochemists 47 Cambrian Period 47 carbon sequestration 47 interglacials 47 inorganic mercury 47 satellite altimetry 47 Biogeochemistry 47 Amazon deforestation 47 cyanobacteria 47 ultraviolet UV radiation 47 Pliocene 47 Warmer oceans 47 angiosperms 47 greenhouse gases GHG 47 tiny single celled 47 atmospheric CO2 enrichment 47 Gregory Asner 47 CO ² emissions 47 magnetosphere 47 aquatic ecosystems 47 mesosphere 47 Thawing permafrost 47 Weiqing Han 47 latitudes 47 anomalously warm 47 isotopic composition 47 Carbon dioxide concentrations 47 vertebrate species 47 methane clathrate 47 #ppm [001] 47 asteroid impacts 47 ozone 47 cosmic rays 47 abundances 47 phytoplankton bloom 47 #.#C warmer 47 insect populations 47 greenhouse gas GHG emissions 47 #.#C #.#F [003] 47 Govindasamy Bala 47 Eocene epoch 47 carbondioxide emissions 47 Ultraviolet radiation 47 nitrogen fertilization 47 Permian Triassic 47 Miocene epoch 47 warming gases 47 coral calcification 47 flood basalts 47 ozone layer 47 peroxynitrite 47 sequestering carbon dioxide 47 Le Quere 47 microplastics 47 methyl mercury 47 suberin 47 Ediacaran 47 greenhouse emission 47 magnetic polarity 47 El Niños 47 Himalayan Glaciers 47 Toba eruption 47 isotope ratios 47 temperate zones 47 orangutan populations 47 nitrogen trifluoride 47 tropical forests 47 biogenic 47 Global warming 47 methyl chloroform 47 Holocene 47 glaciers melting 47 pollutant 47 ultra violet radiation 47 degrees Fahrenheit warmer 47 thawing permafrost 47 radioactive decay 47 Antarctic Ice 47 #.#C #.#C 47 superoxide 47 plankton 47 Velicogna 47 volcanic aerosols 47 climatologists 47 Pacific Decadal Oscillation 47 glacial cycles 47 Global Warming Potential GWP 47 boreal ecosystems 47 bee populations 47 glacial meltwater 47 coastal upwelling 47 radiative 47 NCAR scientist 47 volatiles 47 Type Ia supernovas 46 GJ#b 46 solar corona 46 albedo feedback 46 Serreze 46 hydrosphere 46 nitrous oxide emission 46 Tropical deforestation 46 Chicxulub impact 46 ocean fertilization 46 Medieval Warming 46 sunspots 46 stratospheric ozone layer 46 Climatic Optimum 46 exosphere 46 carbon dioxide methane 46 Noah Diffenbaugh 46 primitive meteorites 46 Boreal forests 46 Carbon dioxide CO2 emissions 46 sediment cores 46 heat trapping 46 marine organisms 46 author Ken Caldeira 46 Svante Arrhenius 46 glaciers receded 46 carbon dioxide CO ² 46 nitrous oxides 46 pollutants 46 Tibetan Plateau 46 polar vortex 46 Alaskan glaciers 46 tailpipe gases 46 Schladow 46 Arctic icecap 46 Friis Christensen 46 Melting glaciers 46 polar oceans 46 sulfuryl fluoride 46 severe droughts 46 carbon 46 atmospheric moisture 46 tholins 46 warming 46 Abdalati 46 geological epoch 46 Fossil fuels 46 herbivory 46 streamflow 46 ecosystems 46 biochar 46 mercury 46 chlorine peroxide 46 co2 46 superheavy elements 46 supercontinent 46 Glacial melt 46 greenhouse gases emitted 46 coral reef degradation 46 Don Wuebbles 46 Earth axial tilt 46 methylation 46 glaciers retreated 46 Orjan Gustafsson 46 Arctic permafrost 46 halogenated gases 46 biogeochemistry 46 amphibian species 46 single celled algae 46 co2 emissions 46 molten magma 46 mid Pliocene 46 Tropical rainforests 46 Cambrian Explosion 46 coral bleaching 46 Indian Ocean Dipole 46 C4 photosynthesis 46 receding glaciers 46 biogenic emissions 46 heat trapping greenhouse gases 46 nutrient runoff 46 dangerous anthropogenic interference 46 lunar crust 46 manmade greenhouse gas 46 urate 46 Cyanobacteria 46 dustier stormier atmosphere 46 Inez Fung 46 nucleation 46 airborne pollutants 46 Plate tectonics 46 magnetic reconnection 46 geoid 46 atmospheric pollutants 46 explosive eruptions 46 biogeographic 46 Deforestation 46 Ulysses spacecraft 46 alkalinity 46 supercomputer simulations 46 mountain snowpacks 46 coronal heating 46 biospheric 46 denitrification 46 heatwaves floods droughts 46 isotopic 46 tropospheric temperature 46 metallicity 46 harmful ultraviolet radiation 46 coral reefs 46 ozone depleting compounds 46 marine biodiversity 46 anthropogenic aerosols 46 permafrost thaw 46 photosynthetic microbes 46 continental crust 46 radiocarbon dating 46 aragonite 46 dynamical processes 46 glacial ice 46 SO2 emission 46 isotope fractionation 46 dissolved oxygen 45 SSTs 45 Anthony Barnosky 45 multicellular organisms 45 downwelling 45 #.#C [002] 45 photochemical reactions 45 degrees Celsius #.#F [001] 45 abiogenesis 45 Svedhem 45 ocean basins 45 El Ninos 45 carbonate ions 45 seagrasses 45 emitting greenhouse gases 45 floods heatwaves droughts 45 AMSR E 45 floods droughts heatwaves 45 sunspot numbers 45 tectonic plate movements 45 sequester carbon 45 Elevated CO2 45 carbon dioxide emission 45 ozone concentrations 45 disappearing glaciers 45 mercury pollution 45 atmospheric oceanic 45 ostracods 45 geosynchronous orbit reached 45 supervolcanoes 45 heat trapping pollutants 45 isostatic rebound 45 temperature gradients 45 chemical reactivity 45 CO2 eq 45 Co2 emissions 45 temperate forests 45 climate modeler 45 Siberian permafrost 45 carbon isotope ratios 45 carbon emission 45 olivine 45 Medieval Warming Period 45 carbonyl sulfide 45 elevated atmospheric CO2 45 ocean currents 45 Antarctic krill 45 Earth ozone layer 45 terawatts 45 global weirding 45 sedimentary deposits 45 sequester atmospheric 45 sulfur dioxide SO2 45 osmium 45 marine ecosystem 45 Climate Impacts Group 45 biodiversity hotspots 45 fossil 45 sedimentation 45 sun irradiance 45 upwellings 45 GHG emission 45 pre biotic 45 single celled organisms 45 acrolein 45 biosequestration 45 photochemistry 45 Sumatra Andaman earthquake 45 WASP #b 45 primate evolution 45 phosphorus pollution 45 boreal regions 45 irradiance 45 kelp forests 45 sunlike stars 45 Atlantic Multidecadal Oscillation AMO 45 basaltic rocks 45 droughts floods storms 45 Professor Hoegh Guldberg 45 oxygenic photosynthesis 45 CO ₂ 45 methane concentrations 45 organic compounds 45 Paytan 45 Atlantic thermohaline circulation 45 photosynthetically 45 Sr Ca 45 degrees above preindustrial 45 carbon isotopes 45 dissolved salts 45 NSIDC 45 deplete ozone 45 CaCO 3 45 longwave radiation 45 nutrient pollution 45 temperature reconstructions 45 stratospheric ozone chemistry 45 anammox 45 glacier melting 45 biogeochemical cycle 45 Permian Triassic boundary 45 melting icecaps 45 Extinctions 45 martian atmosphere 45 megafires 45 heatwaves droughts 45 chlorophyll concentrations 45 tropical peatlands 45 PETM 45 Svensmark 45 Late Devonian 45 peatlands 45 animal phyla 45 harmful algal blooms 45 fossil fuel 45 melting ice 45 reef habitats 45 Nature Geoscience 45 malonyl CoA 45 Venusian atmosphere 45 Jakobshavn Isbrae 45 CAIs 45 Late Paleozoic 45 carbon dioxide CO2 emission 45 biota 45 arsenate 45 chondrites 45 carbon sequestering 45 biogeochemical 44 orbital eccentricity 44 gases emitted 44 volcanic eruptions 44 chondritic 44 magmas 44 Mauna Loa Observatory 44 Diatoms 44 glacier melts 44 Canadell 44 supernova explosions 44 Ross Salawitch 44 Southern Oscillation 44 silicate rocks 44 warmer wetter winters 44 interannual variability 44 snowpack 44 NCEAS 44 GCRs 44 vertical wind shear 44 meridional flow 44 ocean salinity 44 photosynthesizing 44 Photosynthesis 44 martian meteorites 44 climatic 44 Quaternary Period 44 tectonic activity 44 atmospheric deposition 44 #.#C [004] 44 Siberian Traps 44 Jonathan Overpeck 44 Domoic acid neurotoxin 44 picosecond 44 Jay Famiglietti 44 placental mammals 44 photosynthesise 44 missing baryons 44 phosphorus runoff 44 supercontinents 44 equatorial Pacific Ocean 44 forest ecosystems 44 Mausumi Dikpati 44 planet habitability 44 pliosaur ferocious predator 44 solar insolation 44 organic molecules 44 temperate regions 44 gases 44 Millennium Ecosystem Assessment 44 Gerald Meehl 44 cloud condensation nuclei 44 phosphorus 44 bacterial decomposition 44 impactors 44 Amundsen Sea Embayment 44 tropical latitudes 44 Maunder minimum 44 bioavailable iron 44 heat trapping gasses 44 peat soils 44 2 MeV electron 44 subduction zones 44 Antarctic Circumpolar Current 44 sub glacial lakes 44 gigaton 44 photochemical smog 44 glacier retreat 44 fissure eruption 44 oscillations 44 Himalayan river basins 44 nitrogen oxide NOx emissions 44 protein beta amyloid 44 Deccan Traps 44 boreal 44 eukaryote 44 GHG reductions 44 paleoclimatologists 44 bioenergy crops 44 Miller Urey experiment 44 ozone depleting substances 44 Elevated mercury 44 GhG emissions 44 neutrinos 44 hydrothermal activity 44 explosive volcanism 44 Hesperian Epoch 44 heat trapping emissions 44 wetter winters 44 soil fertility 44 nucleosynthesis 44 Amazonian forests 44 neutrons 44 glaciers retreating 44 supernovae 44 moon gravitational pull 44 lunar magma 44 Dr van Ommen 44 subtropical regions 44 polar icecaps 44 thermal gradients 44 prebiotic molecules 44 hydrofluorocarbons HFCs 44 meteoritic material 44 spicules 44 ocean eddies 44 nutrient 44 carbonic acid 44 echinoderm 44 waterbird species 44 Diporeia 44 produced Friedlingstein 44 greenhouse gas emission 44 Earthlike planets 44 methane hydrates 44 groundwater depletion 44 melt glaciers 44 decaying vegetation 44 cirrus clouds 44 foraminifera 44 elemental abundances 44 upwelling 44 crop yields 44 meteor impacts 44 hydroxyl radicals 44 SeaWiFS 44 oxidant 44 Jay Lawrimore chief 44 tetrapods evolved 44 microfossils 44 dissolved oxygen levels 44 eruptive activity 44 speciation 44 Antarctic stratosphere 44 otoliths 44 Arctic oscillation 44 Climategate scandal 44 glacier melt 44 GHG emitted 44 manmade global warming 44 NF3 44 Landsea 44 aboveground biomass 44 protective ozone layer 44 soil salinity 44 C# emissions 44 Gamma ray burst 44 Sulfur dioxide emissions 44 Oligocene epoch 44 El Nino warming 44 marine plankton 44 Nature Geosciences 44 Geophysical Research 44 kyr 44 global warming gases 44 salps 44 degrees Fahrenheit above preindustrial 44 Fomalhaut b 44 Sheldon Drobot 44 GZK cutoff 44 synthetic nitrogen fertilizer 44 droughts heatwaves 44 Type Ia supernova 44 mercury emissions 44 Salinity 44 interstellar clouds 44 hematite mineral 44 radioactive nuclei 44 megafauna extinction 44 outlet glaciers 44 microbial ecosystems 44 ostracodes 44 huxleyi 44 antineutrinos 44 SO2 44 chytrid 44 Evaporation 44 glaciological 44 airglow 44 homochirality 44 auroral activity 44 SGK1 44 supersymmetric particles 44 palaeoclimate 44 km3 44 isotherms 44 Nature Geoscience journal 44 moon Enceladus 44 melting icebergs 44 Permian Triassic extinction 44 radiocarbon dates 44 Saharan dust 44 methylmercury 44 CO2 emitted 44 epigenetic changes 44 Arctic Ocean 44 single celled bacteria 44 vertebrates 44 Martian atmosphere 44 heatwaves floods 44 bee pollination 44 HABs 44 TAL effector 44 chlorofluorocarbons 44 soils 44 degree Fahrenheit 44 X ray pulses 44 emmissions 44 gas hydrates 44 megadroughts 44 degree Centigrade 43 emissons 43 Polar Regions 43 catechins 43 trophic cascades 43 electrochemical oxidation 43 vertebrate fossil 43 naturally occurring compounds 43 methane hydrate 43 sulfur dioxide emission 43 solar minima 43 Earth rotational axis 43 NOX emissions 43 organisms 43 hybrid poplars 43 Palaeocene Eocene thermal 43 nitrogen oxides NOx emissions 43 nitrate 43 peat lands 43 Neoproterozoic 43 Joan Kleypas 43 sun ultraviolet radiation 43 climatological 43 IPCC Intergovernmental Panel 43 hypoxic zone 43 biogeochemist 43 corals 43 cometary material 43 Dry Valleys 43 planktonic algae 43 Climate Change IPCC 43 paleoclimate records 43 bioaccumulation 43 asparagine 43 YORP effect 43 endemism 43 KT extinction 43 asteroid collisions 43 cellular metabolism 43 dwelling organisms 43 species 43 El Nio 43 ppm 43 carbon fluxes 43 assimilative capacity 43 peatland 43 geologically active 43 oceanic 43 gyres 43 wolverine habitat 43 IPCC 43 journal Geophysical Research 43 Schmittner 43 Martian meteorites 43 geomorphology 43 polar mesospheric clouds 43 Albedo 43 bristlecone pines 43 lipids 43 emission reductions 43 lunar perigee 43 -# degrees Fahrenheit [002] 43 photosynthetic machinery 43 isotopic ratios 43 crustal 43 Fine particulate 43 numerical simulations 43 Scripps Oceanography 43 kelvin 43 melt Himalayan glaciers 43 auroral 43 telescopic observations 43 vertebrate evolution 43 serum homocysteine 43 Rayleigh scattering 43 halocarbons 43 seismicity 43 coral reef ecosystems 43 groundwater withdrawals 43 reproductive hormones 43 Harmful algal blooms