Imagine flooding a desert half the size of the Sahara. Using 238 trillion gallons of desalinated ocean water to do the job. Creating millions of 1-acre-square micro-reservoirs to grow enough algae to gobble up all of Earth’s climate-changing carbon dioxide. The idea is risky, unproven, even unlikely to work, according to Y Combinator. But if it did work, it could slow climate change.

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