CO2 concentrations hit highest levels in 3 million years

carbon dioxide, climate change, NASA

YALE ENVIRONMENT 360 – The concentration of carbon dioxide in the atmosphere hit 415.39 parts per million (ppm) over the weekend — the highest level seen in some 3 million years, before humans existed, according to scientists at the Mauna Loa Observatory in Hawaii. CO2 levels are now rising 3 ppm each year, up from an average 2.5 ppm over the last decade, the scientists said.

“Every year it goes up like this we should be saying ‘No, this shouldn’t be happening. It’s not normal,’” Ralph Keeling, director of the Scripps CO2 Program, said in a statement. “This increase is just not sustainable in terms of energy use and in terms of what we are doing to the planet.” …

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