Related by context. Frequent words. (Click for all words.) 73 ppm 57 #g t [003] 56 ppb 55 mg l 55 #ppm [003] 53 ppm U#O# 53 greenhouse gas concentrations 52 #.#g t Au [006] 52 º C 52 ° C 52 #.#g t [006] 51 % Cu 51 atmospheric CO2 51 #g t [002] 50 ppb Au 50 #.#g t Au [001] 50 t Au 50 #.#C [002] 49 #.#g t gold [003] 49 % eU#O# 49 g Au 49 ppb gold 48 gigatons 48 degree centigrade 48 grams tonne 48 % Li2O 47 g tonne 47 g t 47 atmospheric carbon dioxide 47 degrees Celsius 46 opt Au 46 g t gold 46 mineralized intercepts 46 gpt silver 46 degree Celsius 45 degrees centigrade 45 g t silver 45 gpt Au 44 nanograms per 44 PM# [003] 44 CO2 44 g t Ag 44 mmol L 44 degrees Centigrade 43 #mg [002] 43 megatonnes 43 #.#mg [004] 43 greenhouse emissions 43 sulphate 43 NO2 42 emissions 42 micrograms 42 NOx emissions 42 μg 42 microns 42 6g 42 ° C. 42 degrees celsius 42 sulfate 42 emission 42 #.#g [002] 42 Co2 41 ° Celsius 41 microgram 41 μm 41 anomalous gold 41 antimony 41 deg C 41 ozone depletion 41 GHGs 41 ° F 41 degrees Fahrenheit 40 wt 40 oz ton 40 ozone 40 pH 40 mg 40 CO2 emissions 40 C# emissions 40 ng ml 40 emission reductions 40 Concentrations 40 #mg [001] 40 particulate emissions 40 nitrogen dioxide 40 º C. 40 degree celsius 40 Carbon dioxide emissions 39 milligrams 39 carbon dioxide CO2 39 GHG emissions 39 g dL 39 ng mL 39 SO2 39 g km 39 Garnaut 39 #.#g [005] 39 oz t 39 Nitrate 39 isotopic 39 2C