Related by context. Frequent words. (Click for all words.) 53 interglacial 51 PETM 51 glaciation 48 sunspot activity 47 intensities 46 ˚ C 46 ° C 46 CO2 concentrations 45 maximum 45 degree Celsius 45 decadal 45 degree centigrade 44 degrees Centigrade 44 NSIDC 44 degrees Celsius 44 irradiance 44 sunspot 44 atmospheric CO2 43 volcanism 43 hydrological cycle 43 greenhouse warming 43 minima 43 Medieval Warm Period 43 #.#C [002] 42 degree celsius 42 degrees centigrade 42 gigatonnes 42 picosecond 42 maxima 42 atmospheric carbon dioxide 42 volcanic activity 42 degrees Celcius 41 greenhouse gas concentrations 41 º C 41 Little Ice Age 41 perigee 41 tolerated dose MTD 41 amplitudes 41 temperature gradient 41 Holocene 41 amplitude 41 degrees Fahrenheit 41 ozone depletion 41 velocities 40 periodicity 40 duration 40 Pliocene 40 deg C. 40 gigatons 40 temperature 40 #ppm [001] 39 lithosphere 39 degrees celsius 39 excitation 39 femtoseconds 39 aerosol particles 39 GeV 39 maximum allowable 39 mid latitudes 39 seismicity 39 substorms 39 parole ineligibility 39 oxygen uptake 39 crustal 39 stratospheric ozone 39 dBA 39 deg C 39 volcanic earthquakes 39 N2O 39 º C. 38 icecap 38 El Ninos 38 centigrade 38 ocean acidity 38 latitudes 38 microliter 38 #oC [002] 38 climatological 38 kPa 38 magnitudes 38 relative humidity 38 ozone concentrations 38 oscillations 38 atmospheric concentrations 38 conductance 37 ENSO 37 Greenland Ice 37 sunspots 37 geomagnetic storm 37 species extinctions 37 troposphere 37 Greenland ice 37 ambient temperature 37 Nature Geoscience 37 permafrost 37 anisotropy 37 glacial melt 37 vertical wind shear 36 polar 36 msec 36 intensity