Clean tech companies could see a boom under President-elect Joe Biden, but just how much hinges on Tuesday's Senate election in Georgia.

A large part of Biden's platform is devoted to a plan to "clean energy," with promises to invest $400 billion over 10 years into innovation. If the Senate remains in Republican hands, his plan is unlikely to get as much traction, so environmentalists are looking at Tuesday's Senate races in Georgia as their best hope. A Democrat sweep could mean a big win for California, home to dozens of green energy companies and a national leader in the environmental legislation.

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