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takyon writes:

Silicon Valley's largest accelerator is looking for carbon-sucking technologies — including one that could become 'the largest infrastructure project ever'

Earlier this week, Y Combinator, which has backed companies like Airbnb and Reddit, put out a request for startups working on technology that can remove carbon dioxide from the atmosphere.

"It's time to invest and avidly pursue a new wave of technological solutions to this problem — including those that are risky, unproven, even unlikely to work," Y Combinator's website says.

Y Combinator is looking for startups working on four approaches that they acknowledge "straddle the border between very difficult to science fiction" — genetically engineering phytoplankton to turn CO2 into a storage-ready form of carbon, speeding up a natural process in which rocks react with CO2, creating cell-free enzymes that can process carbon, and flooding Earth's deserts to create oases.

Sam Altman, the president of Y Combinator, acknowledged that these ideas are "moonshots," but said that he wants to take an expansive approach to the issue.

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