Carbon Dioxide Concentration in the Earth’s Atmosphere Has Hit Levels Unseen for 3 Million Years

The concentration of carbon dioxide in the Earth’s atmosphere has reached levels not seen for 3 million years, scientists at Mauna Loa Observatory in Hawaii said Monday – offering a dire warning about the impact of human activity on the planet. The observatory’s sensors registered carbon dioxide levels of 415 parts per million (ppm) on […]

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