Related by context. Frequent words. (Click for all words.) 60 CO2 concentrations 60 atmospheric CO 59 #ppm [001] 58 atmospheric CO2 57 gigatonnes 57 ppm 57 degree centigrade 56 º C 56 CO ² 55 ° C 55 atmospheric concentrations 55 #.degree [001] 55 radiative forcing 54 degrees Fahrenheit 54 degrees Farenheit 54 greenhouse gas concentrations 54 ˚ C 53 N2O 53 atmospheric carbon dioxide 53 atmospheric methane 52 isoprene 52 g l 52 gigatons 52 #.#C [004] 52 ozone concentrations 52 ° F 51 interglacial period 51 kPa 51 greenhouse gases GHG 51 mg l 51 centigrade 50 CO2 50 nmol L 50 irradiance 50 GPa 49 degrees centigrade 49 degrees Centigrade 49 pH 49 ° F. 49 pg mL 48 relative humidity 48 GHGs 48 SO2 emissions 48 subtropical regions 48 Co2 48 deg 48 º C. 48 z = 47 terrestrial ecosystems 47 SO2 47 nitrous oxides 47 GHG reductions 47 psig 47 ppb 47 troposphere 47 biosphere 47 degrees Celcius 47 CO2e 47 nitrous oxide emissions 47 #oC [002] 47 Sulfur dioxide 47 Tg 47 earths 47 alkalinity 47 maxima 47 desorption 46 mg dl 46 megatonnes 46 aerosol particles 46 stratospheric ozone 46 drylands 46 ^ sub 46 salinity 46 anthropogenic 46 ° C. 46 -# degrees Celsius [001] 46 ocean acidity 46 nitrogen fixation 46 NaCl 46 Medieval Warm Period 45 nM 45 acidifying 45 ppm U 45 minima 45 interglacial 45 degress 45 mM 45 Article ChemPort 45 carbon dioxide CO2 45 brix 45 degrees Celsius 45 neutral pH 45 temperate zones 45 acidified 45 NO2 45 sulfides 45 soils 45 Younger Dryas 45 Oxides 45 Concentrations 45 sulfur dioxide SO2