Humans are reversing a long-term cooling trend tracing back at least 50 million years, and it’s taken just two centuries. Without reductions in our GHG emissions, our climates by 2150 could compare to the warm and mostly ice-free Eocene, an epoch that characterized the globe 50 million years ago.

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Humans are reversing a long-term cooling trend tracing back at least 50 million years, and it’s taken just two centuries. Without reductions in our GHG emissions, our climates by 2150 could compare to the warm and mostly ice-free Eocene, an epoch that characterized the globe 50 million years ago.