Back in May, Swiss start-up Climeworks unveiled a massive machine that sucks carbon dioxide out of the sky.

Photo by Julia Dunlop/Climeworks.

The idea? To not just slow climate change, but reverse it.

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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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