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(Click for frequent words.) 65 atmospheric CO 64 ppmv 63 anthropogenic emissions 61 gigatons 61 ppm CO2 61 CO2 eq 61 terrestrial biosphere 61 atmospheric CO2 60 gigatonnes 60 gigaton 60 gigatonne 59 Appy Sluijs 59 atmospheric CO2 concentration 59 anthropogenic carbon dioxide 58 radiative forcing 58 kyr 58 yr -1 57 forcings 57 atmospheric CO2 levels 57 ° C warmer 57 Gigatonnes 57 km3 57 2oC 57 Permian Triassic 57 oC 57 Zeebe 57 kelvin 57 carbon dioxide concentrations 56 atmospheric methane 56 logarithmic scale 56 anthropogenic CO 56 ppbv 56 anthropogenic greenhouse gas 56 co2 56 δ 55 Eemian 55 kT 55 Ice Ages 55 CO2 concentrations 55 earths surface 55 Carbon dioxide CO2 55 W/m2 55 Paleocene Eocene Thermal Maximum 55 cm -3 55 Mg Ca 55 sequestering CO2 55 Global Warming Potential GWP 55 atmospheric CO2 concentrations 54 GHG concentrations 54 teragrams 54 atmospheric carbon dioxide 54 mT 54 CaCO 3 54 η 54 Late Devonian 54 ozone O3 54 surface temperatures SSTs 54 volcanic aerosols 54 #.#C above 54 #.#C [004] 54 permafrost melts 54 CaCO3 54 Palaeocene Eocene Thermal Maximum 54 Late Ordovician 54 Cambrian Period 54 #.#oC [001] 54 Fig. 4A 54 chondrites 54 interglacial period 54 Phanerozoic 54 reactive nitrogen 53 benthic foraminifera 53 Wm -2 53 teleconnections 53 mid Pliocene 53 isotherms 53 Atmospheric CO2 53 interannual variability 53 chondritic 53 deglaciation 53 meV 53 σ 53 cosmic ray flux 53 methane CH4 53 cm -2 53 GPa 53 θ 53 paleoclimatic 53 CO2 CH4 53 Stratospheric ozone 53 interannual 53 mammal extinctions 53 carbon dioxide CO ² 53 glacial interglacial 53 lowermost mantle 53 Sr Ca 52 phytoplankton biomass 52 ~ LATEST REVIEWS 52 anthropogenic warming 52 interglacial periods 52 Hadean 52 #.#C #.#F [003] 52 hydrologic cycle 52 isotopic composition 52 anthropogenic CO2 52 terawatts 52 carbon isotopes 52 Indian Ocean Dipole 52 sediments deposited 52 keV 52 Pliocene 52 sqrt 52 nitrous oxide N2O 52 interglacial 52 Great Oxidation Event 52 lithosphere 52 mantle convection 52 potent greenhouse gas 52 #ppm [001] 52 IPCC AR4 52 methane burps 52 terrestrial ecosystems 52 τ 52 sulfate aerosol 52 CO2 52 anthropogenic 52 multi decadal 52 olivines 52 SO2 emission 52 Ly alpha 52 Supplementary Fig 51 degrees Fahrenheit warmer 51 Sunspot Cycle 51 Supplementary Table 51 shear modulus 51 Rahmstorf 51 aerosol concentrations 51 cosmic ray intensity 51 silicate rocks 51 Gt 51 midlatitudes 51 sheet Summerhayes 51 gdp 51 ~ NOW PLAYING 51 biocapacity 51 stoichiometry 51 Kharecha 51 climate forcings 51 carbon fluxes 51 ref. 51 sedimentary deposits 51 Russo FN Riffic 51 isotope composition 51 Cow burps 51 tropopause 51 atmospheric concentrations 51 magmatism 51 #ppm [002] 51 Climatic Change 51 planktonic foraminifera 51 Quaternary Period 51 isotopic compositions 51 basaltic rocks 51 anthropogenically 51 jrw ccg 51 ω 51 methyl chloroform 51 z = 51 SN #/#/# [002] 51 Medieval Warming Period 51 warmings 51 Le Quéré 51 platinum Pt 51 Fig. 1A 51 crustal rocks 51 CO ² 51 Medieval Warm Period 51 Figs. 51 isoprene 51 Keeling Curve 51 Eq. 51 Cenozoic Era 50 cm ^ sup 50 EROEI 50 exajoules 50 Å -1 50 isotope ratios 50 biogenic emissions 50 Mtoe 50 sulphate aerosols 50 Permian Triassic boundary 50 #.#C #.#C 50 ε 50 Southern Oscillation 50 hydrological cycle 50 Elevated concentrations 50 seafloor sediments 50 ppm Zn 50 glacial interglacial cycles 50 Last Glacial Maximum 50 Lengai 50 JIMMY JONES 50 EROI 50 sulfur dioxide SO 50 #x# ^ 50 Messinian 50 galaxy redshift 50 Greenhouse Gases 50 Neogene 50 pliosaur ferocious predator 50 nitrogen oxide NOX 50 ρ 50 oxygen isotope 50 anthropogenic greenhouse gases 50 #ppm U 50 By DAVID MELSON 50 isotopic ratios 50 Tertiary Period 50 Toba eruption 50 isotope fractionation 50 seabed sediments 50 solar irradiance 50 earths 50 temperate grasslands 50 #ppm Cu 50 Cretaceous Paleogene 50 tropospheric 50 SOx NOx 50 geological epoch 50 coccolithophores 50 strontium isotope 50 radiative 50 DOI #.#/nature# 50 logarithm 50 sulfate aerosols 50 nitrogen oxides NO 50 upper troposphere 50 #Be 50 martian meteorites 50 glaciers melted 50 Co2 50 anthracene 50 SiO 49 Malte Meinshausen 49 supernova SN 49 excrete methane 49 #mV V 49 Fig. 3B 49 Sumatra Andaman earthquake 49 atmospheric ozone 49 Late Paleozoic 49 #m@#.# % [002] 49 CO -2 49 ˚ C. 49 post perovskite 49 wavefunction 49 biosphere 49 hydrosphere 49 CarbonSMART ™ enterprise 49 fig. S3 49 IR spectra 49 calcium Ca 49 Kyoto obliges 49 Anthropogenic 49 Sulphur dioxide 49 #ppb [001] 49 sulfur isotope 49 By JEFF McNIELL 49 Snowball Earth 49 cyanogen poisonous gas 49 Carboniferous Period 49 Earth biosphere 49 carbon isotope ratios 49 Paleocene Eocene 49 ha -1 49 CO2 equivalents 49 Nature vol 49 nonzero 49 tropospheric ozone 49 Gabriel Vecchi 49 Greenhouse gasses 49 decadal variability 49 forams 49 mineralize 49 Mt CO2e 49 #ppm CO2 49 Fig. 4c 49 SSTs 49 Arctic icecap 49 mol 49 pentacene molecule 49 IPCC Intergovernmental Panel 49 nitrous oxides NOx 49 cow burps 49 megatonnes 49 Amazonian forests 49 silicate dust 49 NO3 49 P#O# 49 degree Centigrade 49 ° Fahrenheit 49 stratospheric ozone chemistry 49 acidifying oceans 49 Million Years Ago 49 enthalpy 49 sequestering carbon dioxide 49 marine sediments 49 polar icecap 49 climatic variability 49 Pleistocene Ice Age 49 anomalously warm 49 ppm Pb 49 oxygen isotope ratios 49 Reference Scenario 49 photoionization 49 CaO 49 albedo 49 geochronology 49 humans Homo sapiens 49 endorses halving 49 icesheets 49 resonance frequency 49 Fig. 1b 49 magnetic polarity 48 ^ sup -1 48 decadal 48 = strlen 48 SNe Ia 48 sedimentological 48 KT boundary 48 total solar irradiance 48 STAFF PHOTO TOM SPADER 48 Medieval Warm Period MWP 48 methanogenesis 48 C4 grasses 48 equilibration 48 Younger Dryas 48 Fig. 2c 48 μV 48 absorbs CO2 48 carbon sequestered 48 neodymium Nd 48 unmineable coal seams 48 Am J Pathol 48 greenhouse gas concentrations 48 = null & 48 Anthony Barnosky 48 longwave radiation 48 Fig. 3b 48 J Clin Invest 48 radiative transfer 48 fluxes 48 glaciations 48 Int J Epidemiol 48 Â ± 48 isotherm 48 Hanna Alldrin 48 Rayleigh scattering 48 hydrocarbons HC 48 alpine glaciers 48 interactome 48 halogenated gases 48 oceanic circulation 48 aboveground biomass 48 respired 48 Antarctic ozone 48 polar caps 48 -# deg [002] 48 MTOE 48 J Appl Physiol 48 iridium layer 48 absorption coefficient 48 preindustrial 48 electronvolts 48 Br Med J 48 Harvati 48 cave stalagmites 48 1Mt 48 sylvite 48 Gangotri glacier 48 biospheric 48 Greenland Antarctica 48 stratospheric ozone depletion 48 AD.L Top 48 #.#C warmer 48 γ 48 paleoclimate 48 W/cm2 48 Fig. 2A 48 carbons 48 earths crust 48 hm hm 48 mK 48 global weirding 48 psia 48 Ediacaran 48 GeV 48 PETM 48 logarithmic 48 argon atoms 48 sulfur dioxide SO2 nitrogen 48 Gd#O# 48 gravitational acceleration 48 mantle xenoliths 48 Ozone O3 48 nonlinearities 48 sunspot cycles 48 multiplicative 48 Alpine glaciers 48 Cold Dark Matter 48 Eur Respir J 48 Jevrejeva 48 2 MeV electron 48 Earthâ € ™ 48 GHGs 48 AR4 48 poleward 48 glaciation 48 #.#F [001] 48 helium nuclei 48 kcal mol 48 fig. S2 48 El Niño Southern Oscillation 48 methane clathrates 48 3g t 48 saline aquifer 48 Svante Arrhenius 48 asthenosphere 48 dinitrogen 48 saline aquifers 48 Neoproterozoic 48 pika habitat 48 isotopic 48 extractable reserves 48 anthropogenic climate 48 carbondioxide 48 greenhouse warming 48 paleomagnetic 48 dissolved inorganic 48 geological strata 47 oxygenic photosynthesis 47 sequester atmospheric 47 reionization 47 Little Ice Age 47 Palaeozoic sedimentary 47 Supplementary Figs 47 volcanism 47 Greenland icesheet 47 thermal inertia 47 glacial melt 47 lavas 47 ocean basins 47 carbonate minerals 47 #ppb Au [002] 47 supervolcanoes 47 absorption spectra 47 photoemission 47 sedimentary layers 47 hydrofluorocarbons perfluorocarbons 47 ms -1 47 Corot 9b 47 cratons 47 unsigned int 47 -# mV [002] 47 piotr.skolimowski @ thomson.com 47 gaseous pollutants 47 El Chichon 47 SiO 2 47 Jellyfish swarm northward 47 troposphere 47 tailpipe gases 47 Pu'u O'o crater 47 ppm U 47 degrees above preindustrial 47 THE COSMOS ROCKS 47 Miocene epoch 47 fig. S1 47 anorthosite 47 Cu Equivalent 47 Anthropocene 47 continental crust 47 Rossby waves 47 Fig. 1c 47 adsorbate 47 g cm 47 twd ccg 47 Brigham Grette 47 springtime ozone 47 metastable 47 solvation 47 DOI #.#/science.# 47 tropospheric temperature 47 Tropical deforestation 47 photolysis 47 geoid 47 gigapascals 47 trillionth tonne 47 Permian Period 47 chlorophyll concentrations 47 subglacial 47 regression coefficients 47 NH4 + 47 m ^ sup 47 anthropogenic CO2 emissions 47 peat soils 47 #ppb [003] 47 Atlantic Multidecadal Oscillation AMO 47 jovian 47 Melting Glaciers 47 boreal ecosystems 47 photochemical reactions 47 E = mc 47 dpa kr 47 Cosmic Microwave Background 47 Fig. 2C 47 ^ ^ sup 47 ghg emissions 47 Quaternary Science Reviews 47 economically extractable 47 photosynthetic organisms 47 warm interglacial 47 J Biol Chem 47 geological timescales 47 Prochlorococcus 47 mM NaCl 47 #mn b d 47 carboniferous 47 Paleoclimate 47 dangerous anthropogenic interference 47 glaciers melt 47 interglacials 47 single celled microbes 47 mE 47 compressive stress 47 mass extinction 47 hydroxyl radical 47 Permian extinction 47 kg/m3 47 colliding tectonic plates 47 endothermic 47 Triassic Period 47 º Celsius 47 equatorial bulge 47 ~ 47 J Exp Med 47 greenhouse gases GHG 47 acidity pH 47 axial tilt 47 resource depletion 47 crustal thickness 47 Nd 47 microvolts 47 cerium Ce 47 metal zonation 47 ppm molybdenum 47 fissure eruption 47 adrian.krajewski @ thomson.com 47 TiO 47 Greenland icecap 47 spatial variability 47 #.# bpa 47 Eur Urol 47 SO2 emissions 47 Mg ha 47 Paleogene 47 @ gn 47 Cryogenian 47 airglow 47 #.#/pnas.# 47 seawater pH 47 cyclically adjusted 47 Fig. 47 noble gases 47 Otto Bliesner 47 strange quark 47 Greenland Ice 47 ° С 47 earth crust 47 cesium atom 47 Radiocarbon 47 Himalayan river basins 47 N2O emissions 47 dpa dg 47 2ppm 47 Cretaceous Tertiary boundary 47 nitrotyrosine 47 Surface Temperature 47 Coulomb blockade 47 inorganic mercury 47 geoneutrinos 47 tectonic plate movements 47 mid latitudes 46 magnetic substorms 46 antimony Sb 46 otolith 46 sunspot cycle 46 halite 46 terawatt 46 thermal conductance 46 aerosol particles 46 CH4 46 ENSO cycle 46 Middle Pleistocene 46 atmospheric circulations 46 Cf 46 SNR #-#.# 46 glacial ice 46 Nola Weinstein 46 nT 46 KT extinction 46 calcul 46 Plate Tectonics 46 N2O 46 Stefan Rahmstorf 46 blackbody 46 torr 46 #:#-# [020] 46 albedo reflectivity 46 mN 46 φ 46 hypogene mineralization 46 earliest hominid 46 Habitable Planet 46 Siple Dome 46 Storing carbon dioxide 46 Halifax Weather Overcast 46 DOI #.#/j.cub.#.#.# 46 ammonia NH3 46 dioxide 46 #,# bis 46 speleothems 46 nitrate nitrite 46 Degradation REDD 46 TCu 46 Jakobshavn Isbrae 46 adsorbed 46 J Physiol 46 CuT 46 Eocene epoch 46 E#M# 46 Oecologia 46 SST anomalies 46 ENSO 46 dipole moment 46 Earth axial tilt 46 Fe Mg 46 FeO 46 tiny single celled 46 X ray pulses 46 g/m3 46 NDVI 46 carbonate ion 46 thermal gradients 46 aragonite 46 oxygen isotopic composition 46 1μm 46 -# º C [002] 46 dissolved oxygen pH 46 ocean acidity 46 Trichodesmium 46 Arctic permafrost 46 degrees Celsius #.#F [001] 46 chlorine monoxide 46 marine phytoplankton 46 ChemPort 46 nuclides 46 satellite altimetry 46 quantum oscillations 46 angiosperm 46 m z 46 bioavailable iron 46 hydrothermal fluid 46 arcsec 46 Mg Fe 46 intraplate 46 amplifying feedbacks 46 peat lands 46 ounces Moz. 46 dwelling organisms 46 #degreesC 46 permafrost degradation 46 photosynthetic pigments 46 GHG reductions 46 ν 46 Mesozoic Era 46 Paleozoic Era 46 Sciencexpress 46 vol 46 U Th 46 Pierre Friedlingstein 46 Noachian 46 hysteresis loop 46 sequesters carbon 46 Nat Rev Neurosci 46 diene 46 arcseconds 46 ppm 46 Warmer seas 46 geosphere 46 sulfidic 46 Tunguska Siberia 46 humid tropics 46 monotonically 46 SCIAMACHY 46 methanogenic bacteria 46 Acid Rain Program 46 spatial scales 46 dpa nr 46 abyssal plain 46 microfossils 46 tCO2e 46 planetary warming 46 cometary material 46 Corinne Le Quéré 46 Mercury exosphere 46 Holocene 46 carbonyl sulfide 46 prokaryotes 46 preindustrial levels 46 temperature reconstructions 46 Strongly anomalous 46 nitrogen isotope 46 dpa hl 46 megatons 46 NR CC 46 unsigned char 46 1kHz 46 XP fip5 ~ 46 Early Cretaceous 46 Climate Change UNFCC 46 SCIENCE MATTERS 46 dpa si 46 Celsius #.#F 46 fermion 46 pp #-# 46 Palaeocene Eocene thermal 46 kPa 46 arcmin 46 absorbs carbon dioxide 46 Cenozoic 46 mu m 46 anerobic 46 Oligocene epoch 46 cyclicity 46 & gt 46 Stegodon 46 advection 46 Kia Optima LX 46 carbon dioxide CO2 emitted 46 plagioclase 46 biogeographic 46 cryovolcanism 46 Rubisco 46 biogenic 46 Shiveluch 46 Min temp 46 macrocrystic 46 permafrost soils 46 Permo Triassic 46 Fig. 2B 46 Behrenfeld 46 Psychiatr Serv 46 3d Ex 46 chlorine peroxide 46 2C #.#F 46 Eur J Endocrinol 46 GJ#b 46 arcminutes 46 Deccan Traps 46 Fig. 2b 46 coral skeletons 46 º C 46 Puijila 46 biogeochemical processes 46 pyrope garnets 46 R LANV CC 46 Andrew Dessler 46 downwelling 46 thermodynamic properties 45 #ppb gold 45 Plate tectonics 45 orbitals 45 Cell Mol Biol 45 Terbium Tb 45 mmol 45 boreal regions 45 hydrofluorocarbons HFCs perfluorocarbons PFCs 45 Min Temp #.# 45 = sizeof 45 Rignot 45 depositional environment 45 lunar meteorites 45 GISS analysis 45 acidify 45 submillimetre wavelengths 45 Kyoto binds 45 coolings 45 compressional 45 subseafloor 45 = null 45 antiparticle 45 palaeo 45 flood basalts 45 dpa fp 45 disappearing glaciers 45 cadmium Cd 45 CO -2 emissions 45 olivine 45 TW Incl 45 alkane 45 autotrophic 45 SO2 45 True thicknesses 45 Raman spectra 45 Saturn auroras 45 baryon 45 5g t 45 Ordovician extinction 45 oxidized mercury 45 linewidth 45 paleoenvironmental 45 Neanderthal genome sequence 45 Plimer 45 GHG emitted 45 dBFS 45 Late Cretaceous 45 dpa rt 45 χ 45 dpa sch 45 interfacial tension 45 subducting plate 45 preindustrial times 45 biogeochemical 45 hydrate deposits 45 MWNT 45 anthropogenic aerosols 45 = -#.# 45 Co2 emissions 45 Fig. 3a 45 rhizosphere 45 picosecond 45 lithium oxide 45 μm diameter 45 R LAV 45 perovskite 45 LIMITED CHINA 45 mtoe 45 Georg Kaser 45 emits #g/km [001] 45 nonlinearity 45 atmospheric aerosols 45 radiocarbon dated 45 Pu'u O'o 45 #.#ppm [001] 45 J Affect Disord 45 geological sequestration 45 averaging #.#g t [003] 45 J Hypertens 45 Chicxulub 45 Ecoscience Population Resources 45 º Fahrenheit 45 Big Bang cosmology 45 mammal lineages 45 terrestrial vertebrate 45 plankton blooms 45 megapascals 45 gha 45 carbon dioxide 45 nucleon 45 dissolved salts 45 dpa tg 45 faunas 45 Fig. 1B 45 dustier stormier atmosphere 45 Article PubMed ChemPort 45 ³ ³ 45 ppm boron 45 Ozone depletion 45 Schizophr Bull 45 tropical troposphere 45 dpa sm 45 biogeochemical cycle 45 Biogeosciences 45 Animas vein 45 Am J Epidemiol 45 dpa ms 45 CO ₂ 45 Acidification 45 thermal equilibrium 45 photoelectron 45 GOSAT 45 OGJ Mar. 45 oxide hydrofluorocarbons perfluorocarbons 45 PG LAV 45 magnon 45 quasiparticle 45 tropical latitudes 45 1ppm 45 pawel.sobczak @ thomson.com 45 #mln ton 45 argc 45 #.#nm [002] 45 elastic moduli 45 DOI #.# 45 ^ [002] 45 Precambrian 45 planktonic algae 45 sequesters carbon dioxide 45 basaltic lava 45 species extinctions 45 Late Jurassic 45 oxyhemoglobin 45 osmium 45 hydrothermal activity 45 Cretaceous Tertiary KT 45 A1B scenario 45 redox sensitive 45 pp.# [002] 45 Himalayan Glaciers 45 cosine 45 H. habilis 45 sunspot activity 45 #ppm Mo 45 var = # [001] 45 CO2e 45 Isoprene 45 A1B 45 scf ton 45 Methane CH4 45 clathrates 45 #.#-#.# degrees Fahrenheit [002] 45 centistokes 45 Warmer oceans 45 Syrtis Major 45 Amundsen Sea 45 Article ChemPort 45 microampere 45 Earth Overshoot Day 45 J Immunol 45 methane hydrate 45 El Nino Southern Oscillation 45 gigatonnes Gt 45 Caspar Ammann 45 IPCC TAR 45 PARTIES TO THE 45 megadroughts 45 emitting fossil fuels 45 paleoecology 45 vanadate 45 dpa cb 45 ppm eU 45 auroral activity 45 vegetation greenness 45 #OHD 45 Au Pd 45 biogeochemical cycles 45 J Infect Dis 45 temporal variability 45 Cu Eq 45 = #.#f 45 usual BAU 45 linear extrapolation 45 megathrust 45 Jay Lawrimore chief 45 Shakhova 45 homo sapiens sapiens 45 Copeia 45 abundances 45 Fig. 1a 45 ecoregions 45 Ann Intern Med 45 melting polar icecaps 45 Eocene Epoch 45 Sulphur Dioxide 45 Glacial melt 45 co2 emissions 45 Haber Bosch 45 mm ^ sup 45 Environ Health Perspect 45 Laki eruption 45 μM 45 emmisions 45 lunar crust 45 anion 45 Doppler shifts 45 CAIs 45 GJ #b [002] 45 Deccan volcanism 45 New Phytologist 45 polar oceans 45 ppm eU#O# 45 Venusian atmosphere 45 upper tropospheric 45 brachiopods 45 MgO 45 Hg 45 sidereal 45 Kyoto Protocol obliges 45 document.getElementById