Carbon Dioxide Set an All-Time Monthly High

With May in the books, it’s official: carbon dioxide set an all-time monthly record. It’s a sobering annual reminder that humans are pushing the climate into a state unseen in millions of years. Carbon dioxide peaked at 409.65 parts per million for the year, according to data from the National Oceanic and Atmospheric Administration. It’s not a surprise that it happened....

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The Earth just reached a CO2 level not seen in 3 million years

Some records aren’t meant to be broken — but when it comes to climate change, humans still haven’t gotten the memo. Last fall, the Earth passed a major climate milestone when measurements taken at Hawaii’s Mauna Loa Observatory showed that atmospheric concentrations of carbon dioxide had passed — potentially permanently — 400 parts per million. This week, measurements...

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