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High Hopes plans to extract atmospheric CO2 with hot air balloons – Engadget

Freezing CO2 is easier just below the stratosphere.

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A German-Israeli startup has chosen Earth Day to announce its plan to launch an audacious carbon capture plan with balloons. High Hopes believes that its proposed solution will make it easier, and cheaper, to extract large volumes of CO2 from the air. The company has only launched a few trial missions to test its theory so far, but is sufficiently encouraged by them to go public with its idea.
Carbon dioxide freezes, to make dry ice, at minus 78 degrees celsius (-109 fahrenheit), which takes a lot…

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