This gure shows concentrations of carbon dioxide in the atmosphere from hundreds of thousands of years ago through 2015, measured in parts per million (ppm). The data come from a variety of historical ice core studies and recent air monitoring sites around the world. Each line represents a di erent data source. Data source: Compilation...Continue Reading
This gure shows worldwide emissions of carbon dioxide, methane, nitrous oxide, and several uorinated gases from 1990 to 2010. For consistency, emissions are expressed in million metric tons of carbon dioxide equivalents. These totals include emissions and sinks due to land-use change and forestry. Data sources: WRI, 2014; FAO, 2014 * HFCs are hydrofluorocarbons,...Continue Reading
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