Today in America, Donald Trump decided to leave the most significant climate treaty of the 21st century.

At a ceremony in the White House Rose Garden, the president announced that the U.S. would begin the process of pulling out of the Paris Agreement, which requires signatories to strive to limit global temperature rise to 2 degrees Celsius.

Meanwhile, in Switzerland, two engineers unveiled this baby:

Photo by Julia Dunlop/Climeworks.

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A lot of people are worried about the environment right now. And President Trump ... well, he's not helping.

Photo by Drew Angerer/Getty Images.

He's called climate change a Chinese hoax, made no secret of his disdain for the Clean Power Plan, and signaled that he plans to withdraw the U.S. from the Paris climate deal.

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For a modern-day climate scientist, this rock could be magical.

A basalt core with carbonate crystals growing inside. Photo from Annette K. Mortensen/University of Southampton.

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