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(Click for frequent words.) 83 atmospheric carbon dioxide 79 CO2 concentrations 76 atmospheric CO 74 atmospheric CO2 concentration 73 carbon dioxide concentrations 69 atmospheric methane 69 atmospheric CO2 levels 67 atmospheric CO2 concentrations 67 greenhouse gas concentrations 66 greenhouse warming 66 anthropogenic emissions 65 atmospheric concentrations 65 ocean acidity 65 anthropogenic 64 ppmv 63 CO2 63 deglaciation 62 anthropogenic CO2 emissions 61 anthropogenic greenhouse gas 61 radiative forcing 61 forcings 61 hydrological cycle 61 Le Quéré 61 GtC 60 species extinctions 60 hydrologic cycle 60 GHG concentrations 60 Palaeocene Eocene Thermal Maximum 60 carbon dioxide 60 CO ² 60 anthropogenic CO2 59 climatic variability 59 albedo 59 acidification 58 anthropogenic carbon dioxide 58 nitrogen deposition 58 ppm CO2 58 terrestrial ecosystems 58 anthropogenic greenhouse gases 58 extinctions 58 thermal inertia 58 anthropogenic climate 58 oceanic circulation 57 terrestrial biosphere 57 carbon sinks 57 Kharecha 57 Eemian 57 planetary warming 57 atmospheric circulation 57 aerosol particles 57 solar irradiance 57 2oC 57 reactive nitrogen 57 stratospheric ozone 57 carbon dioxide CO2 57 glacial interglacial cycles 57 Zeebe 57 ozone depletion 57 gigatonnes 57 glacial melting 57 N2O emissions 57 sunspot activity 57 anthropogenic warming 56 Medieval Warm Period 56 interglacial period 56 sulfate aerosols 56 mid latitudes 56 Keeling Curve 56 climate modellers 56 Atmospheric CO2 56 Co2 56 sulphate aerosols 56 phytoplankton biomass 56 nitrogen fixation 56 GHGs 56 oxidized mercury 56 N2O 56 ° C warmer 56 warmings 55 Little Ice Age 55 greenhouse gasses 55 poleward 55 CO -2 55 nitrification 55 greenhouse gases 55 phytoplankton 55 sulfate aerosol 55 ghg emissions 55 water vapor 55 Greenland icesheet 55 coccolithophores 55 thermohaline circulation 55 glaciation 55 interglacial periods 55 seawater pH 55 cosmic ray flux 55 Greenhouse gasses 55 manmade CO2 emissions 55 #.#oC [001] 55 glacial interglacial 55 glacial melt 54 potent greenhouse gas 54 ppbv 54 tropospheric 54 isoprene 54 Anthropogenic 54 atmospheric nitrogen 54 interglacial 54 ocean acidification 54 Rignot 54 Rossby waves 54 sequestering CO2 54 atmospheric CO2 enrichment 54 volcanism 54 Rahmstorf 54 nitrous oxide emissions 54 mammal extinctions 54 paleoclimatic 54 gaseous pollutants 54 Carbon dioxide CO2 54 phosphorus concentrations 54 tropospheric ozone 53 coolings 53 Earth biosphere 53 surface temperatures SSTs 53 aerosol concentrations 53 anthropogenically 53 atmospheric ozone 53 teleconnections 53 Medieval Warm Period MWP 53 troposphere 53 marine sediments 53 Le Quere 53 SO2 emissions 53 methane CH4 53 axial tilt 53 anthropogenic CO 53 glacier shrinkage 53 marine phytoplankton 53 midlatitudes 53 CO -2 emissions 53 Greenland ice 53 Atlantic thermohaline circulation 52 Last Glacial Maximum 52 Carbon dioxide 52 upper troposphere 52 mass extinctions 52 #.#C [004] 52 carbon dioxide emissions 52 plankton blooms 52 glaciers 52 glaciations 52 diatoms 52 acidifying 52 climate alarmists 52 evapotranspiration 52 SSTs 52 2C #.#F 52 methanogenesis 52 warm interglacial 52 polar caps 52 atmospheric aerosols 52 greenhouse emissions 52 ozone layer depletion 52 Appy Sluijs 52 stomatal conductance 52 salinity 52 biosphere 52 #.#C #.#C 52 Behrenfeld 52 glacial retreat 52 Carbon dioxide emissions 52 Paleocene Eocene Thermal Maximum 52 preindustrial levels 52 multi decadal 52 Snowball Earth 51 Global Warming Potential GWP 51 icecaps 51 ozone O3 51 global warming 51 Younger Dryas 51 mantle convection 51 phytoplankton blooms 51 phytoplankton populations 51 ozone depleting gases 51 gigatons 51 greenhouse gas emissions 51 decadal 51 paleoclimate 51 nitrous oxide N2O 51 CO2 emissions 51 Ozone depletion 51 #ppm [001] 51 atmospheric moisture 51 Carbon Dioxide 51 W/m2 51 oC 51 stratospheric ozone depletion 51 co2 51 tropopause 51 GHG emissions 51 alpine glaciers 51 Greenland Ice 51 Holocene 51 Permian extinction 51 photosynthesis 51 C4 grasses 51 permafrost 51 climate modelers 51 CO2 eq 51 Stratospheric ozone 51 Corinne Le Quere 51 temperature gradients 51 Indian Ocean Dipole 51 nitrogen fertilization 51 Gigatonnes 51 amplifying feedbacks 51 boreal ecosystems 51 greenhouse gas 50 Ice Ages 50 climatic variations 50 Greenhouse gases 50 #.#C [002] 50 icesheets 50 Serreze 50 absorbing carbon dioxide 50 CO ² emissions 50 carbondioxide emissions 50 oceanic currents 50 permafrost melts 50 Cryogenian 50 volcanic aerosols 50 Trichodesmium 50 carbonate minerals 50 mass extinction 50 photosynthetic organisms 50 tropical troposphere 50 carbondioxide 50 tropical deforestation 50 dangerous anthropogenic interference 50 C# atmospheric concentrations 50 interannual variability 50 #.#C warmer 50 biogenic emissions 50 runaway greenhouse 50 anomalously warm 50 Medieval Warming Period 50 seafloor sediments 50 Species extinction 50 Phytoplankton 50 carbon dioxide CO ² 50 permafrost thaws 50 temperature reconstructions 50 Arctic oscillation 50 geological timescales 50 emissions 50 greenhouse gas nitrous oxide 50 earths 50 Co2 emissions 50 melting permafrost 50 Arctic icecap 50 thermosphere 50 isotope ratios 50 peroxynitrite 50 deforestation 50 GHG emission 49 Anthropocene 49 degrees Celsius #.#F [001] 49 climate forcings 49 trophic levels 49 isotope fractionation 49 lithosphere 49 Great Oxidation Event 49 benthic foraminifera 49 interannual 49 carbonate ion 49 polar vortex 49 Amundsen Sea 49 heat trapping carbon dioxide 49 meltwater 49 cosmic ray intensity 49 Corinne Le Quéré 49 clathrates 49 acidifying oceans 49 Alpine glaciers 49 oceans 49 glacier melt 49 atmospheric chemistry 49 sediments deposited 49 subglacial 49 RBP4 49 sunspot cycle 49 warming 49 absorbs carbon dioxide 49 Himalaya glaciers 49 #.#C #.#F [003] 49 anthropogenic aerosols 49 glacial cycles 49 methane clathrate 49 isotopic composition 49 geological epoch 49 methane 49 manmade greenhouse gases 49 chloride concentrations 49 photosynthetic 49 Paleoclimate 49 radiative 49 Ocean acidification 49 preindustrial times 49 biogenic 49 El Niños 49 plate tectonics 49 #ppm CO2 49 ozone depleting compounds 49 carbon isotope ratios 49 Medieval Warming 49 polar icecap 49 iron fertilization 49 teragrams 49 Wm -2 49 denitrification 49 greenhouse gases GHG 49 sulfur isotope 49 decadal variability 48 radiocarbon 48 IPCC AR4 48 tropospheric temperature 48 gigatonne 48 Stefan Rahmstorf 48 NOX emissions 48 CO2 CH4 48 Svante Arrhenius 48 forams 48 CaCO 3 48 amphibian declines 48 Pliocene 48 icesheet 48 glaciers melted 48 longwave radiation 48 diatom 48 biospheric 48 icecap 48 Southern Oscillation 48 carbon emissions 48 sediments 48 glaciers melt 48 nitrogen oxides emitted 48 nitrous oxides 48 Sr Ca 48 subglacial lakes 48 coastal upwelling 48 ozone layer 48 supersaturation 48 permafrost degradation 48 KT boundary 48 emmissions 48 Earth rotational axis 48 atmospheric 48 kyr 48 acidify 48 Otto Bliesner 48 Prochlorococcus 48 co2 emissions 48 mantle plumes 48 degrees Fahrenheit warmer 48 Schladow 48 manmade greenhouse gas 48 Velicogna 48 aridity 48 temperate zones 48 exajoules 48 chlorine monoxide 48 biogeochemical cycles 48 solvation 48 Pacific Decadal Oscillation 48 interglacials 48 greenhouse gases GHGs 48 glacial meltwater 48 Fram Strait 48 Antarctic ice 48 melting glaciers 48 annealing temperature 48 Amazonian forests 48 oVOCs 48 permafrost thaw 48 advection 48 springtime ozone 48 chlorophyll concentrations 48 mid Pliocene 48 atmospheric deposition 48 heat trapping gases 48 paleomagnetic 48 latitudes 48 marine ecosystems 48 peatlands 48 Rubisco 47 isotherms 47 boreal 47 cryosphere 47 Antarctic Ice 47 Kilimanjaro glaciers 47 mountain glaciers 47 climate change 47 Cambrian Period 47 carbon sequestered 47 salinities 47 Nitrogen oxide emissions 47 Himalayan Glaciers 47 Climategate scandal 47 Laurentide ice sheet 47 substorm 47 asparagine 47 alkalinity 47 herbivory 47 Elevated CO2 47 degrees Celsius above preindustrial 47 Permian Triassic 47 mid tropospheric 47 oxygen isotope 47 sunspot numbers 47 carbon dioxide emission 47 polar regions 47 stratospheric ozone chemistry 47 elastic moduli 47 photosynthesizing 47 burning fossil fuels 47 tectonic uplift 47 SO2 emission 47 sealevel 47 inorganic mercury 47 megafauna 47 halogenated gases 47 ozone 47 nitrogen oxide NOx emissions 47 Tropical deforestation 47 warmer wetter winters 47 degree centigrade 47 sedimentary deposits 47 Quaternary Period 47 bioavailable iron 47 forest ecosystems 47 Miocene epoch 47 greenhouse gas GHG emissions 47 bacterial decomposition 47 tectonic plate movements 47 Antarctic glaciers 47 Alaskan glaciers 47 El Nio 47 mountain snowpacks 47 Coulomb blockade 47 multidecadal 47 carbon dioxide CO2 emissions 47 NOx emissions 47 crustal rocks 47 oxygenic photosynthesis 47 methyl chloroform 47 CO2emissions 47 carbon fluxes 47 Pielke 47 peat lands 47 basaltic rocks 47 gyres 47 Biogeochemistry 47 Malte Meinshausen 47 lake sediments 47 outlet glaciers 47 mesosphere 47 sheet Summerhayes 47 δ 47 absorb carbon dioxide 47 glaciers receded 47 satellite altimetry 47 coral calcification 47 magma ocean 47 earths surface 47 climatological 47 carbonic acid 47 palaeoclimate 47 atmospheric pollutants 47 irradiance 47 deep convective clouds 47 ecoregions 47 Greenland glaciers 47 particulate emissions 47 sun irradiance 47 C# emissions 47 angiosperms 47 Earth albedo 47 downwelling 47 elevated atmospheric CO2 47 Antarctic ozone 47 Atlantic Multidecadal Oscillation AMO 47 thermal gradients 47 nutrient loading 47 abundances 47 Mg Ca 47 Arctic permafrost 47 boreal regions 47 isostatic rebound 47 Tibetan Plateau 47 Earth Overshoot Day 47 #mn b d 47 tropical latitudes 47 Canadell 47 phytoplankton bloom 47 chlorine peroxide 47 subsurface ocean 46 Jakobshavn 46 terawatts 46 GHG 46 Carbon dioxide concentrations 46 Friis Christensen 46 peat soils 46 sulfate 46 equilibration 46 acidic oceans 46 emission reductions 46 geoid 46 CO ₂ 46 methane clathrates 46 dissolved salts 46 permafrost soils 46 methane burps 46 glacial ice 46 hydrosphere 46 Antarctic stratosphere 46 Ordovician extinction 46 radioactive decay 46 perturbation 46 nitrous oxide emission 46 auxin 46 pollutant 46 Ecological Footprint 46 hydroxyl radical 46 recrystallization 46 emissons 46 yr -1 46 Younger Dryas cold 46 dissolved inorganic 46 Late Ordovician 46 Dr Raupach 46 temperature gradient 46 albedo feedback 46 magnetic polarity 46 polar ice 46 glacier retreat 46 Late Devonian 46 ozone depleting chemicals 46 asthenosphere 46 abiogenesis 46 nitrogen 46 total solar irradiance 46 Neoproterozoic 46 carbon isotopes 46 sunspot cycles 46 tailpipe gases 46 anammox 46 ozone concentrations 46 silicate rocks 46 Ken Caldeira 46 biosequestration 46 CO2 emmissions 46 Schmittner 46 GHG emitted 46 Amazon deforestation 46 cloud condensation nuclei 46 emmisions 46 biodiversity 46 malonyl CoA 46 Late Paleozoic 46 atmospheric ozone layer 46 nitrogen oxides NOx 46 magnetic substorms 46 silicic acid 46 Mbd 46 CO2 emitted 46 Phanerozoic 46 photosynthesise 46 Ediacaran 46 equatorial Pacific Ocean 46 osmotic stress 46 photosynthetic apparatus 46 eutrophication 46 biogeographic 46 El Nino warming 46 AR4 46 sequestering carbon dioxide 46 photochemical reactions 46 greenhouses gases 46 isotopic 46 cratons 46 nitrogen oxide NOX 46 upwelling 46 assimilative capacity 46 metallicity 46 Svensmark 46 supersolid 46 streamflow 46 chondrites 46 aerosols 46 degree Centigrade 46 dissolved oxygen levels 46 methanogens 46 airborne pollutants 46 GHG reductions 46 hydrothermal activity 46 isotopic variations 46 PETM 46 Sulphur dioxide 46 fossil fuels 46 desorption 46 sulfur dioxide SO2 46 Ultraviolet radiation 46 Aiguo Dai 46 Lindzen 46 boreal forests 46 solar nebula 46 solar minima 45 Gt 45 meteorite bombardment 45 Arctic Oscillation 45 harmful ultraviolet UV radiation 45 Global warming 45 NCAR scientist 45 landmasses 45 Pacific decadal oscillation 45 crustal 45 thermally induced 45 carbon dioxide methane 45 gases emitted 45 Boreal forests 45 sulphate particles 45 phonon 45 SO2 45 #.#C above 45 palmitoleate 45 isotherm 45 Climatic Optimum 45 dissolved oxygen 45 decoherence 45 enthalpy 45 meteorite impacts 45 stratospheric ozone layer 45 gaseous emissions 45 taxa 45 moon gravitational pull 45 ferroelectricity 45 emitting greenhouse gases 45 SOx emissions 45 Jevrejeva 45 carbon 45 compressive stress 45 SST anomalies 45 Warmer oceans 45 EROEI 45 superoxide 45 biogeochemical 45 ocean ecosystems 45 biocapacity 45 fossilisation 45 nitrogen excretion 45 temperate regions 45 cryovolcanism 45 Landsea 45 punctuated equilibrium 45 thawing permafrost 45 hydroxyl radicals 45 ecological overshoot 45 sequester carbon 45 paleoclimatologists 45 Carbon dioxide CO2 emissions 45 ostracodes 45 harmful gasses 45 ILUC 45 radiocarbon dates 45 reef habitats 45 aboveground biomass 45 decadal scale 45 martian atmosphere 45 bicarbonate ions 45 droughts floods storms 45 radiative transfer 45 manmade global warming 45 landfalling hurricanes 45 poleward shift 45 Himalayan glaciers melting 45 sulphate 45 km3 45 oxygen isotopes 45 storminess 45 Orjan Gustafsson 45 Trenberth 45 biota 45 resource depletion 45 autotrophic 45 nucleotide substitutions 45 meridional overturning circulation 45 Oligocene epoch 45 El Nino Southern Oscillation 45 peatland 45 nitrogen oxides NOx emissions 45 dynamical processes 45 deplete ozone 45 biochar 45 Toba eruption 45 warming gases 45 exosphere 45 El Niño Southern Oscillation 45 continental crust 45 ENSO cycle 45 ecosystems 45 Halifax Weather Overcast 45 Keith Briffa 45 flue gasses 45 carbonate globules 45 volcanic activity 45 NADH 45 C4 photosynthesis 45 arsenate 45 Amstrup 45 vertical wind shear 45 thermal equilibrium 45 Eocene epoch 45 fluxes 45 interfacial tension 45 gravitational acceleration 45 El Ninos 45 wetter winters 45 Govindasamy Bala 45 GCRs 45 biogeochemical processes 45 polar latitudes 45 meridional flow 45 stoichiometry 45 carbon emission 45 salt NaCl 45 Plimer 45 global weirding 45 subtropical oceans 45 Melting glaciers 45 waterbird populations 45 fine grained sediment 45 nutrient runoff 45 sequester atmospheric 45 suberin 45 sediment cores 45 foraminifera 44 geosynchronous orbit reached 44 global warming alarmists 44 2ppm 44 serum homocysteine 44 lowermost mantle 44 calcifying organisms 44 supercontinents 44 Milankovitch cycles 44 Warmer seas 44 tiny single celled 44 Gabriel Vecchi 44 hydrofluorocarbon HFC 44 megafires 44 Glacial melt 44 nitrogen trifluoride 44 pH 44 reproductive hormones 44 photolysis 44 anthropogenic global warming 44 synthetic nitrogen fertilizer 44 Madden Julian Oscillation 44 planet habitability 44 dustier stormier atmosphere 44 Waleed Abdalati director 44 acetylation 44 Pierre Friedlingstein 44 photosynthetically 44 Eutrophication 44 salps 44 CHD mortality 44 ocean eddies 44 soil carbon sequestration 44 di GMP 44 Permian Triassic boundary 44 methylation 44 logarithmically 44 Palaeocene Eocene thermal 44 non linearities 44 climatic 44 carbon sequestering 44 colder drier 44 tectonic stresses 44 Geoengineering 44 ocean fertilization 44 metastable 44 Pleistocene Ice Age 44 tropical peatlands 44 Venusian atmosphere 44 microevolution 44 Min Temp #.# 44 tropical forests 44 glaciers retreated 44 isotopic signature 44 HABs 44 degrees above preindustrial 44 ocean salinity 44 Earth axial tilt 44 martensite 44 Weiqing Han 44 speciation 44 HCFC 44 rhizosphere 44 glaciers melting 44 microbially 44 nitrate leaching 44 sulphates 44 dwelling organisms 44 nucleation 44 glacier melts 44 acrylamide formation 44 obliquity 44 ENSO 44 Earth ozone layer 44 urate 44 subducted 44 molten magma 44 planetesimals 44 microbial ecosystems 44 ocean ridges 44 author Ken Caldeira 44 nonlinearities 44 Cyanobacteria 44 planktonic algae 44 mercury emissions 44 endothermic 44 groundwater depletion 44 soils 44 pollutant concentrations 44 Maunder minimum 44 fossil fuel 44 radiocarbon dating 44 GHG pollution 44 lavas 44 sunspots 44 cyanobacterial 44 orangutan populations 44 GPa 44 missing baryons 44 subtropical regions 44 organometallic compounds 44 biogeochemistry 44 Kelvin -# 44 nutrient inputs 44 Geophysical Research 44 pHs 44 thermal gradient 44 preindustrial 44 superoxides 44 temperate grasslands 44 drylands 44 Millennium Ecosystem Assessment 44 Gangotri glacier 44 single celled microbes 44 Saturn auroras 44 adiabatic 44 Haber Bosch 44 Milankovitch 44 sulfuryl fluoride 44 Eric Rignot 44 ocean sediment cores 44 NOx 44 CH4 44 continental drift 44 sediment 44 hydrofluorocarbons HFCs 44 austral summer 44 heat trapping greenhouse 44 PER2 44 torsional vibrations 44 midge populations 44 hypoxic zone 44 peat bogs 44 spatial scales 44 Joan Kleypas 44 cyanobacteria 44 orbital eccentricity 44 perovskite 44 Evaporation 44 Anthony Barnosky 44 thermohaline 44 Jakobshavn Isbrae 44 IPCC 44 NSIDC 44 permafrost melting 44 explosive volcanism 44 hurricanes Landsea 44 martian meteorites 44 Greenland Antarctica 44 disappearing glaciers 44 adsorbate 44 radiometric measurements 44 osmotic pressure 44 megadroughts 44 Demand BOD 44 tectonic activity 44 Abdalati 44 HFC refrigerants 44 periodicities 44 carbonyl sulfide 44 sequesters carbon 44 IPCC Intergovernmental Panel 44 electron density 44 upwellings 44 humans Homo sapiens 44 hotter drier summers 44 aragonite 44 gigaton 44 climatologists 44 CO2 emission reductions 44 observable phenomena 44 ppm 44 Particulate Matter PM 44 angular momentum 44 Paleocene Eocene thermal 44 biogeochemical cycle 44 daidzein 44 ozone depleting substances 43 Cambrian explosion 43 GJ#b 43 ° C 43 Yearly suicides 43 sulfur aerosols 43 matrix interferences 43 refugia 43 microplastics 43 meteor impacts 43 monotonically 43 bioenergy crops 43 anerobic 43 ocean basins 43 PBDE concentrations 43 CO2 fluxes 43 volcanic plumes 43 hydrocarbons HC 43 emmission 43 electrochemical oxidation 43 sedimentation 43 Deforestation 43 ascorbate 43 degree Fahrenheit 43 Harvati 43 glaciological 43 oxygen isotopic composition 43 lunar crust 43 degrees Fahrenheit above preindustrial 43 Hoegh Guldberg 43 soot particulates 43 #.#-#.# degrees Fahrenheit [002] 43 Caspar Ammann 43 depleting fossil 43 retreating glaciers 43 polyamines 43 Himalayan glaciers 43 Nature Geoscience 43 pressure natriuresis 43 La Nià ± 43 volatiles 43 Extinctions 43 stabilize atmospheric concentrations 43 strontium isotope 43 Luterbacher 43 equatorial regions 43 greenhouse gases emitted 43 Sulfur dioxide pollution 43 Emissions 43 depletion 43 sedimentary layers 43 methane hydrate 43 Coral bleaching 43 melting icebergs 43 nitrogen isotope 43 chondritic 43 moulins 43 sulfur dioxide emission 43 Dansgaard Oeschger 43 Dry Valleys 43 Gregory Asner 43 Luthcke 43 nitrogenase 43 salination 43 τ 43 asymptotic 43 precipitation 43 receding glaciers 43 geoengineering schemes 43 quantum oscillations 43 frictional resistance 43 photosynthetic machinery 43 ultra violet radiation 43 AGW theory 43 Neanderthal extinction 43 º C