The concentration of carbon dioxide, the main, long-lived greenhouse gas causing global climate change, in Earth's atmosphere has reached new heights, according to scientists at Scripps Institution. The new reading of 415.26 parts per million (ppm) on May 11 was the first daily baseline at Hawaii's Mauna Loa Observatory to eclipse 415 ppm. That observatory has kept long-term record of carbon dioxide in the atmosphere since 1958. That data, known as the Keeling Curve, traces the continuous increase in the amount of this greenhouse gas in the Earth's atmosphere since the Industrial Revolution.
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