CO2 in Antarctica reaches 400 PPM for first time in 4 million years

Earth's most remote continent finally caught up with its more populated counterparts. "Carbon dioxide has been steadily rising since the start of the Industrial Revolution, setting a new high year after year," writes Brian Kahn at Climate Central. "There's a notable new entry to the record books. The last station on Earth without a 400 parts per million (ppm) reading has reached it."

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