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The planet's average surface temperature has risen about 212 degrees Fahrenheit (118 degrees Celsius) since the late 19th century, a change driven largely by increased carbon dioxide emissions into the atmosphere and other human activities 4 Most of the warming occurred in the past 40 years, with the seven most recent years being the warmest The years 16 and are tied forThe NOAA Annual Greenhouse Gas Index (AGGI) measures the commitment society has already made to living in a changing climate It is based on the highest quality atmospheric observations from sites around the world Its uncertainty is very low The AGGI is analogous to the dial on an electric blanket Just as the dial does not tell you exactly This chart offers a comprehensive view of global greenhouse gas (GHG) emissions It describes the sources and activities across the global economy that produce greenhouse gas emissions, as well as the type and volume of gases associated with each activity It is an updated version of