The Highest CO2 Levels in Human History

The planet reached a terrifying milestone on Saturday. For the first time in human existence, CO2 concentrations surpassed 415 parts-per-million, according to a reading from the historic Mauna Loa Observatory, The Independent reports.

The Hawaii facility has taken CO2 readings since 1958—but it’s been millions of years since CO2 concentrations were this high, and back then global temperatures were 2-3C higher. When temperatures climb that high again, studies show that swathes of the globe will be unrecognizable.  

And science’s funny man isn’t laughing.

“What I’m saying is: The planet’s on fire,” explained Bill Nye during an expletive-laced interview with John Oliver Sunday, The Washington Post reports. Nye shared a stern message for members of Congress who grew up watching his show:

“I didn’t mind explaining photosynthesis to you when you were 12. But you’re adults now, and this is an actual crisis; got it?”

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