Hawaii's Mauna Loa Observatory has reported that worldwide carbon dioxide levels reached a new record high in April, hitting 410.31 parts per million (ppm). This is the highest concentration of this greenhouse gas seen over the course of human history--and prehistory, for that matter--as the Earth's atmosphere hasn't seen CO2 levels this high in well over 800,000 years, and possibly as long as 20 million years.
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