Bill Gates-backed plan to block the sun and reverse global warming

Silicon Valley elites are throwing their financial weight behind a controversial scheme to fight — .

One of the new VC-funded start-ups, Make Sunsets, has already launched balloons over Baja, releasing sunlight-reflecting aerosols into Earth's stratosphere.

The firm's concept, cooling Earth by bouncing sunlight back into space via sulfate aerosols, is not new. In fact, it's one of many exotic ideas now actively funded by

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