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(Click for frequent words.) 79 atmospheric CO2 78 carbon dioxide concentrations 75 atmospheric carbon dioxide 72 greenhouse gas concentrations 71 atmospheric CO 71 atmospheric CO2 concentration 69 atmospheric CO2 concentrations 67 atmospheric CO2 levels 66 atmospheric concentrations 65 atmospheric methane 64 ppmv 63 ocean acidity 62 GHG concentrations 62 anthropogenic emissions 62 Palaeocene Eocene Thermal Maximum 61 greenhouse warming 61 anthropogenic CO2 60 ppm CO2 59 Eemian 59 sunspot activity 59 CO2 59 anthropogenic carbon dioxide 59 sulphate aerosols 58 species extinctions 58 N2O emissions 58 interglacial period 58 carbon dioxide 58 climatic variability 57 Atmospheric CO2 57 interglacial periods 57 warmings 57 Le Quéré 57 anthropogenic greenhouse gases 57 ° C warmer 56 deglaciation 56 anthropogenic greenhouse gas 56 solar irradiance 56 gigatonnes 56 2oC 56 Kharecha 56 anthropogenic CO2 emissions 56 aerosol concentrations 56 CO ² 56 hydrologic cycle 56 hydrological cycle 55 sulfate aerosols 55 GtC 55 Medieval Warm Period 55 nitrogen deposition 55 anthropogenic warming 55 Zeebe 55 mid latitudes 55 interglacial 55 extinctions 55 axial tilt 55 nitrogen fixation 55 nitrous oxide emissions 55 cosmic ray flux 55 gaseous pollutants 55 #.#C [004] 55 radiative forcing 55 glacial interglacial cycles 54 albedo 54 Co2 54 poleward 54 glacial retreat 54 stratospheric ozone 54 salinity 54 methane concentrations 54 Little Ice Age 54 oxidized mercury 54 #.#oC [001] 54 #ppm [001] 54 sunspot numbers 54 ozone depletion 54 SO2 emissions 54 greenhouse gasses 53 mammal extinctions 53 Greenhouse gases 53 forcings 53 Keeling Curve 53 ppbv 53 alpine glaciers 53 evapotranspiration 53 glaciation 53 aerosol particles 53 seawater pH 53 Ice Ages 53 phosphorus concentrations 53 greenhouse gases 53 coccolithophores 53 Medieval Warm Period MWP 53 glaciations 53 terrestrial ecosystems 53 carbon dioxide CO2 53 #.#C warmer 53 tropospheric 53 anthropogenic 52 GHGs 52 terrestrial biosphere 52 ozone concentrations 52 paleoclimatic 52 dangerous anthropogenic interference 52 Carbon dioxide concentrations 52 ozone depleting gases 52 glacial melt 52 salinities 52 thermal inertia 52 climate modelers 52 warm interglacial 52 glaciers 52 gigatons 52 Appy Sluijs 52 troposphere 52 midlatitudes 52 chloride concentrations 52 tropical troposphere 52 Carbon Dioxide 52 glacial melting 52 Permian extinction 52 tropospheric ozone 52 mass extinctions 52 degree centigrade 52 glacial interglacial 52 temperature reconstructions 52 latitudes 52 reactive nitrogen 52 climate modellers 52 Anthropogenic 52 decadal 52 manmade CO2 emissions 52 paleoclimate 52 nitrification 52 atmospheric circulation 52 surface temperatures SSTs 52 planetary warming 51 oceanic circulation 51 Wm -2 51 CO -2 51 water vapor 51 ghg emissions 51 potent greenhouse gas 51 degrees above preindustrial 51 volcanism 51 N2O 51 Last Glacial Maximum 51 streamflow 51 Le Quere 51 nitrous oxide N2O 51 Rahmstorf 51 Paleocene Eocene Thermal Maximum 51 degrees Celsius above preindustrial 51 marine phytoplankton 51 nitrate concentrations 51 gigatonne 51 polar caps 50 permafrost 50 mid Pliocene 50 Rignot 50 Sr Ca 50 anthropogenic climate 50 tropopause 50 #.#C [002] 50 Greenland icesheet 50 Earth biosphere 50 absorbs carbon dioxide 50 hydrosphere 50 Rossby waves 50 mass extinction 50 anomalously warm 50 Snowball Earth 50 carbon dioxide CO ² 50 biosphere 50 springtime ozone 50 #.#C #.#F [003] 50 carbon dioxide emissions 50 atmospheric CO2 enrichment 50 El Niños 50 #ppm CO2 50 terawatts 50 phytoplankton biomass 50 Behrenfeld 50 SSTs 50 Great Oxidation Event 50 cosmic ray intensity 50 Younger Dryas 50 degrees Fahrenheit warmer 50 upper troposphere 50 Co2 emissions 50 temperature gradients 50 dissolved oxygen levels 49 anthropogenically 49 Medieval Warming Period 49 manmade greenhouse gases 49 carbon sinks 49 Carbon dioxide emissions 49 atmospheric nitrogen 49 heat trapping carbon dioxide 49 icesheets 49 subglacial 49 earths 49 coolings 49 glacier shrinkage 49 atmospheric ozone 49 total solar irradiance 49 Gerald Meehl 49 Global Warming Potential GWP 49 sequestering CO2 49 geological timescales 49 warmer wetter winters 49 nitrogen fertilization 49 methanogenesis 49 nitrous oxides 49 mountain glaciers 49 Greenland Ice 49 preindustrial times 49 oC 49 Elevated CO2 49 Greenland ice 49 tropical deforestation 49 mesosphere 49 2C #.#F 49 Paleoclimate 49 #.#C #.#C 49 phytoplankton blooms 49 CO2 emissions 49 marine sediments 49 anthropogenic CO 49 W/m2 49 pika habitat 49 temperate regions 49 interglacials 49 co2 48 Antarctic ozone 48 Alpine glaciers 48 SO2 emission 48 Permian Triassic 48 Species extinction 48 Greenhouse gasses 48 climatic variations 48 atmospheric 48 Jonathan Overpeck 48 acidification 48 crop yields 48 greenhouse emissions 48 Stefan Rahmstorf 48 sulphate particles 48 Cryogenian 48 tropical latitudes 48 satellite altimetry 48 abundances 48 permafrost melts 48 ozone 48 Gigatonnes 48 C# atmospheric concentrations 48 carbon isotope ratios 48 subtropical regions 48 Carbon dioxide 48 biogeochemical cycles 48 CO -2 emissions 48 Eric Rignot 48 atmospheric aerosols 48 ozone layer depletion 48 Corinne Le Quere 48 sequester carbon 48 isoprene 48 oceans 48 Palaeocene Eocene thermal 48 nitrogen trifluoride 48 C# emissions 48 icecaps 48 greenhouse gases GHG 48 Amazonian forests 48 runaway greenhouse 48 chlorophyll concentrations 48 diatom 48 stratospheric ozone depletion 48 Atlantic thermohaline circulation 48 teleconnections 48 greenhouse gas nitrous oxide 48 dissolved oxygen 48 NSIDC 48 methane 48 isotope ratios 48 polar latitudes 48 Orjan Gustafsson 48 interannual 48 C4 grasses 48 drylands 48 greenhouse gas emissions 48 Ecological Footprint 48 multi decadal 48 sediments deposited 48 Amundsen Sea 48 sunspot cycle 48 subglacial lakes 48 pHs 47 emmisions 47 Miocene epoch 47 CO ² emissions 47 preindustrial levels 47 chlorine peroxide 47 methane CH4 47 polar vortex 47 Nitrogen oxide emissions 47 NCAR scientist 47 denitrification 47 equatorial Pacific Ocean 47 mantle plumes 47 diatoms 47 Cyanobacteria 47 global warming 47 author Ken Caldeira 47 atmospheric moisture 47 aphid populations 47 phytoplankton 47 interannual variability 47 wetter winters 47 photosynthesise 47 heat trapping gases 47 degrees Centigrade #.#F 47 serum calcium 47 aerosols 47 Medieval Warming 47 volcanic activity 47 photosynthetic organisms 47 kyr 47 global weirding 47 anoxic 47 thermohaline circulation 47 Svante Arrhenius 47 radiometric measurements 47 greenhouse gases GHGs 47 Yearly suicides 47 mantle convection 47 Carbon dioxide CO2 emissions 47 mountain snowpacks 47 PETM 47 amphibian declines 47 interfacial tension 47 meteorite bombardment 47 clathrates 47 Pliocene 47 seismicity 47 #.#C above 47 Carbon dioxide CO2 47 absorbing carbon dioxide 47 temperate zones 47 gases emitted 47 paleoclimatologists 47 stomatal conductance 47 tropospheric temperature 47 climate alarmists 47 ozone depleting chemicals 47 boreal regions 47 ENSO 47 glacier melt 47 emitting greenhouse gases 47 coral calcification 46 harmful ultraviolet UV radiation 46 Prochlorococcus 46 temperatures 46 Otto Bliesner 46 Nature Geoscience 46 Antarctic Ice 46 anthropogenic interference 46 phytoplankton populations 46 chlorine monoxide 46 carbonate minerals 46 sulfate aerosol 46 photosynthesis 46 sediments 46 arsenic concentrations 46 Southern Oscillation 46 ppm 46 thermosphere 46 above preindustrial levels 46 co2 emissions 46 atmospheric pollutants 46 megadrought 46 megadroughts 46 fissure eruption 46 meltwater 46 Min Temp #.# 46 volcanic aerosols 46 pollutant concentrations 46 carbon fluxes 46 severe droughts 46 irradiance 46 emissions 46 sealevel 46 Kilimanjaro glaciers 46 solar minima 46 Antarctic glaciers 46 produced Friedlingstein 46 logarithmically 46 acidic oceans 46 anammox 46 glaciers melting 46 situ measurements 46 Min temp 46 Arctic icecap 46 carbon emissions 46 ocean acidification 46 ozone depleting substances 46 Ozone depletion 46 isotopic ratios 46 ocean ridges 46 Phanerozoic 46 absorb carbon dioxide 46 radiocarbon 46 Coulomb blockade 46 degree Centigrade 46 deep convective clouds 46 CO2 eq 46 midge populations 46 carbon isotopes 46 Corinne Le Quéré 46 seafloor sediments 46 plankton blooms 46 Antarctic ice 46 Glacial melt 46 cirrus clouds 46 decadal scale 46 airborne pollutants 46 particulate emissions 46 GHG emissions 46 oxygen isotopes 46 biocapacity 46 isotherm 46 soils 46 Schladow 46 continental crust 46 sulfur dioxide emissions 46 isotopic composition 46 permafrost degradation 46 temperature 46 anthropogenic aerosols 46 warmer wetter 46 carbondioxide 46 CO2emissions 46 nitrous oxide emission 46 ocean salinity 46 emmissions 46 tectonic uplift 46 nitrogen oxide NOx emissions 46 NOX emissions 46 SO2 sulfur dioxide 46 heat trapping greenhouse gas 46 Paleocene Eocene thermal 46 nitrogen oxides emitted 46 stratospheric ozone chemistry 46 Arctic oscillation 46 paleoclimatology 45 advection 45 El Ninos 45 isotherms 45 carbondioxide emissions 45 Govindasamy Bala 45 Noah Diffenbaugh 45 longwave radiation 45 atmospheric oceanic 45 fuel moistures 45 methyl chloroform 45 pH 45 Antarctic stratosphere 45 olivine 45 #.#-#.# degrees Fahrenheit [002] 45 soil moisture 45 KT boundary 45 colder drier 45 climatologists 45 ozone depleting compounds 45 º C 45 Oligocene epoch 45 carbonate ion 45 icecap 45 Himalayan Glaciers 45 biodiversity 45 Younger Dryas cold 45 Greenland glaciers 45 Jevrejeva 45 temperature gradient 45 midlatitude 45 glaciers melt 45 smoothed sunspot number 45 Millennium Ecosystem Assessment 45 sequestering carbon dioxide 45 quantum oscillations 45 Anthropocene 45 Geoengineering 45 emissons 45 Serreze 45 thermal equilibrium 45 Geophysical Research 45 Tibetan Plateau 45 hydrothermal activity 45 acidify 45 elastic moduli 45 spatial scales 45 fine grained sediment 45 insect populations 45 chlorophyll fluorescence 45 Aiguo Dai 45 nitrate leaching 45 monsoon rainfall 45 convection currents 45 NOAA ESRL 45 ultra violet radiation 45 amplifying feedbacks 45 CHAIRMAN CONNAUGHTON Well 45 waterbird species 45 thermal gradients 45 ° C 45 Amazon deforestation 45 Halifax Weather Overcast 45 antineutrinos 45 radon concentrations 45 glacial cycles 45 -# degrees Celsius [001] 45 Sumatra Andaman earthquake 45 Velicogna 45 pCi l 45 Weiqing Han 45 downwelling 45 Ken Caldeira 45 degree Fahrenheit 45 Marijuana potency 45 teragrams 45 airborne soot 45 isotope fractionation 45 atmospheric ozone layer 45 iron fertilization 45 dynamical processes 45 Cambrian Period 45 subtropics 45 angiosperms 45 Particulate Matter PM 45 annealing temperature 45 carbonyl sulfide 45 Holocene 45 km3 45 Kelvin -# 45 Pleistocene Ice Age 45 sunspots 45 coastal upwelling 45 arsenate 45 dustier stormier atmosphere 45 tropics 45 Fine particulate 45 relative humidity 45 soil carbon sequestration 45 Extinctions 45 polar regions 45 IPCC AR4 45 permafrost thaws 45 NOx emissions 45 Evaporation 45 nitrogen 45 disappearing glaciers 45 degrees Fahrenheit above preindustrial 45 glaciers melted 44 polar mesospheric clouds 44 photosynthetic 44 PANHANDLE Temperatures 44 Phytoplankton 44 polar ice 44 harmful gasses 44 Cow burps 44 yr -1 44 CO2 CH4 44 Climatic Optimum 44 dissolved salts 44 melt glaciers 44 glaciers receded 44 alkalinity 44 warming 44 substorm 44 RBP4 44 ozone layer 44 basaltic rocks 44 acidifying oceans 44 sediment cores 44 sulfate particles 44 temperate forests 44 herbivory 44 Arctic ozone depletion 44 martian meteorites 44 lithosphere 44 lake sediments 44 heat trapping emissions 44 atmospheric chemistry 44 hotter drier summers 44 photolysis 44 Ulysses spacecraft 44 equatorial regions 44 Venusian atmosphere 44 nitrogen oxides NOx emissions 44 ostracodes 44 glacial ice 44 Yellowstone caldera 44 cryosphere 44 Tropical rainforests 44 elevated atmospheric CO2 44 airflows 44 photochemical reactions 44 #.#degC [001] 44 Indian Ocean Dipole 44 Miller Urey experiment 44 enthalpy 44 temporal variability 44 planet Earths 44 CO2 fluxes 44 El Nino warming 44 Trichodesmium 44 biosequestration 44 carbon dioxide CO2 emissions 44 geosynchronous orbit reached 44 megafauna 44 sulfuryl fluoride 44 oligotrophic 44 Hawking Radiation 44 Sulphur dioxide 44 Interglacial 44 Earth Overshoot Day 44 Late Paleozoic 44 Dry Valleys 44 Eocene epoch 44 protective ozone layer 44 Hoegh Guldberg 44 carbon dioxide emission 44 sunspot cycles 44 fluorinated gases 44 hydroxyl radical 44 Siple Dome 44 thermal gradient 44 melting glaciers 44 preindustrial 44 ecoregions 44 subsurface ocean 44 emission reductions 44 benthic foraminifera 44 Toba eruption 44 superheavy elements 44 sediment 44 exceedences 44 Canadell 44 supersaturation 44 climate modeler 44 IPCC Intergovernmental Panel 44 greenhouse gases emitted 44 volcanic plumes 44 microvolts 44 Gangotri glacier 44 nutrient inputs 44 forams 44 flue gasses 44 drier soils 44 CO ₂ 44 climate forcings 44 coral bleaching 44 aboveground biomass 44 humid tropics 44 oVOCs 44 supersolid 44 noble gases 44 acidifying 44 CHD mortality 44 Schmittner 44 Bq/m3 44 upwellings 44 #ppm [002] 44 Dr Raupach 44 Polar Regions 44 Sulfur dioxide emissions 44 carbon dioxide methane 44 2ppm 44 particulate matter emissions 44 Gerald Meehl senior 44 soil pH 44 Soil pH 44 relative humidities 44 hotter summers 44 amphibian species 44 Anthony Barnosky 44 Svensmark 44 heat trapping pollutants 44 photosynthetic apparatus 44 Romero Lankao 44 biodiversity hotspots 44 climatic 44 thermal conductance 44 Earth albedo 44 glacier retreat 44 GPa 44 heat trapping greenhouse gases 44 chytrid 44 waterbird populations 44 tropical coral reefs 44 El Nino Southern Oscillation 44 Late Ordovician 44 metallicity 44 biogenic emissions 44 Relative humidity 44 Ecology Letters 44 temperate grasslands 44 dinosaur extinction 44 Amundsen Sea Embayment 44 oxygenation 44 SOx emissions 44 megafires 43 geoneutrinos 43 crustal rocks 43 soil salinity 43 plate tectonics 43 Equatorial Pacific 43 biochar 43 Celsius #.#F 43 Waleed Abdalati director 43 hydrofluorocarbons HFCs 43 #.#F [001] 43 Luterbacher 43 Emissions 43 La Ninas 43 Ocean acidification 43 geoid 43 microcystin 43 acidified 43 NASA satellites orbiting 43 #.#deg [002] 43 NDVI 43 GhG emissions 43 tiny single celled 43 El Niño Southern Oscillation 43 microscopic organisms 43 coral reefs 43 Don Wuebbles 43 emmission 43 sulfur isotope 43 Meridiani 43 Noctilucent clouds 43 winter dormancy 43 Late Devonian 43 minima 43 Melting glaciers 43 Climategate scandal 43 SeaWiFS 43 2 MeV electron 43 climate change 43 biogeochemical processes 43 decadal variability 43 ENSO cycle 43 ragweed pollen 43 CaCO 3 43 sulfur aerosols 43 Coral bleaching 43 subalpine 43 SST anomalies 43 ozone O3 43 Eyjafjallajökull eruption 43 melting permafrost 43 seagrasses 43 2degC 43 Boreal forests 43 serum HBV DNA 43 oxygen isotope 43 methane burps 43 nitrogen leaching 43 tropical forests 43 greenhouse gas GHG emissions 43 Keith Briffa 43 CO2e emissions 43 carbon dioxides 43 magnetic substorms 43 Cambrian explosion 43 eruptive activity 43 sulfur dioxide emission 43 Greenhouse Gases 43 satellite altimeters 43 ppCO2 43 -# degrees Fahrenheit [002] 43 serum sodium 43 dissolved oxygen concentrations 43 Professor Hoegh Guldberg 43 glomerular filtration rate 43 deplete ozone 43 streamflows 43 Gt 43 martian atmosphere 43 Mg Ca 43 deforestation 43 poleward shift 43 flood basalts 43 Concentrations 43 Pacific Decadal Oscillation 43 humidities 43 oceanic currents 43 forest ecosystems 43 journal Geophysical Research 43 cyanobacteria 43 GHG emission 43 Earth axial tilt 43 Climatologists 43 Earth ozone layer 43 endothermic 43 Forage availability 43 Biogeochemistry 43 stromatolites 43 glaciers retreated 43 Ozone Hole 43 CarbonTracker 43 galactic cosmic rays 43 Droughts 43 explosive eruptions 43 IPCC 43 electron density 43 albedo feedback 43 heat trapping greenhouse 43 supervolcanoes 43 hydrological cycles 43 sequester atmospheric 43 microevolution 43 contaminant concentrations 43 unicellular organisms 43 La Nià ± 43 palaeoclimate 43 asthenosphere 43 blackbody 43 paleomagnetic 43 SO2 43 global warming alarmists 43 climate 43 GHG pollution 43 salt NaCl 43 climatological 43 Bindschadler 43 peat soils 43 Jakobshavn Isbrae 43 groundwater withdrawals 43 permafrost thaw 43 precipitation 43 particulate matter emitted 43 -# ° C. [002] 43 Quaternary Period 43 Stratospheric ozone 43 Decadal 43 sulfur dioxide 43 Siberian Traps 43 phytoplankton bloom 43 degrees Celsius #.#F [001] 43 dewpoint temperature 43 metastable 43 Solar Radiation 43 DBPs 43 GISS analysis 43 pH soils 43 solar corona 43 phosphorus runoff 43 radiative 43 airglow 43 GeV 43 degrees Fahrenheit 43 ˚ C 43 transpiration 43 ocean basins 43 solar insolation 43 millivolts 43 Acidification 43 CO2 emmissions 43 manmade greenhouse gas 43 Bio SNG 43 porous sandstone 43 hypoxic zone 43 Atmospheric Carbon Dioxide 43 prussic acid 43 hydroxyl radicals 43 CO2 Emissions 43 exajoules 43 Sulfur Dioxide 43 Pielke 43 insolation 43 Atmospheric Chemistry 43 attosecond 43 austral summer 42 noctilucent clouds 42 spicules 42 evapo transpiration 42 snowpack 42 warm interglacial periods 42 Harvati 42 photosynthesizing 42 degree Celcius 42 fungal strains 42 #mn b d 42 TCE vapors 42 ecological footprints 42 º Celsius 42 exhaled carbon dioxide 42 ferroelectricity 42 Freight TSI 42 degrees Farenheit 42 desorption 42 Alaskan glaciers 42 GOSAT 42 outlet glaciers 42 meridional flow 42 boreal ecosystems 42 degrees centigrade 42 dewpoints 42 GCRs 42 antineutrino 42 methane clathrates 42 carbon dioxide CO2 emitted 42 torr 42 groundwater 42 magmas 42 polar oceans 42 Nielsen Gammon 42 pollutant emissions 42 Fram Strait 42 polar icecap 42 orangutan populations 42 numerical simulations 42 vertical wind shear 42 mK 42 storminess 42 harvested acreage 42 Maunder Minimum 42 pikas 42 molten magma 42 C4 photosynthesis 42 ionized calcium 42 seawater 42 Landsea 42 soil fertility 42 dieldrin 42 º Fahrenheit 42 nutrient loading 42 Ordovician extinction 42 Jay Lawrimore chief 42 slightly acidic pH 42 mesospheric 42 La Niña pattern 42 sedimentary deposits 42 NCAR scientist Gerald Meehl 42 aridity 42 Methane Emissions 42 humans Homo sapiens 42 GCMs 42 Shakhova 42 chondrites 42 amphipods 42 Demand BOD 42 Jakobshavn 42 Particulate emissions 42 abiogenesis 42 Deforestation 42 ocean fertilization 42 Mauna Loa Observatory 42 salps 42 single celled algae 42 speciation 42 decarbonization 42 Miscanthus 42 infectious prions 42 Harmful algal blooms 42 thermocline 42 lunar magma 42 particulate pollution 42 insect outbreaks 42 fluxes 42 increased storminess 42 ˚ C. 42 calcifying organisms 42 methanogens 42 sun irradiance 42 Robock 42 degree Celsius 42 specular reflection 42 Permian Triassic boundary 42 missing baryons 42 La Nina occurs 42 kelvin 42 Surface Temperature 42 Greenhouse Gas Emissions 42 Atlantic Multidecadal Oscillation AMO 42 elevated radon 42 glacial meltwater 42 landfalling hurricanes 42 Cryospheric Sciences Branch 42 Jay Zwally 42 marine ecosystems 42 stalagmites 42 Albedo 42 hydrofluorocarbon HFC 42 cyanobacterial 42 neutrino oscillation 42 Brenda Ekwurzel climate 42 vegetation greenness