Global CO2 in Atmosphere Highest in a Million Years, NOAA Says
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The amount of heat-trapping carbon dioxide in the atmosphere averaged more than 400 parts per million globally for the first time ever in March, according to U.S. government measurements.
The recording was based on air samples taken from 40 sites around the world, the National Oceanic and Atmospheric Administration said in a statement Wednesday. It’s the highest level of the gas in at least a million years.