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Articles by: Eric Holthaus

Humans Didn’t Exist the Last Time there was this Much CO2 in the Air

Humans Didn’t Exist the Last Time there was this Much CO2 in the Air

The last time atmospheric carbon dioxide levels were this high, millions of years ago, the planet was very different. For one, humans didn’t exist. On Wednesday, scientists at the University of California in San Diego confirmed that April’s monthly average atmospheric carbon dioxide concentration breached 410 parts per million for the first time in our history. We know a lot about how to[Read More…]

Let it Go: The Arctic will Never be Frozen Again

Let it Go: The Arctic will Never be Frozen Again

Last week, at a New Orleans conference center that once doubled as a storm shelter for thousands during Hurricane Katrina, a group of polar scientists made a startling declaration: The Arctic as we once knew it is no more. The region is now definitively trending toward an ice-free state, the scientists said, with wide-ranging ramifications for ecosystems, national security, and[Read More…]