The food waste startup founded by Nest alumnus Matt Rogers also received an investment from Amazon's Climate Pledge Fund.

Last Energy will use the funds to build its 5 megawatt pilot reactor in Texas, which it hopes to turn on next year.

Everbloom has also developed a chemical process to transform waste fibers and feathers into upcycled materials that resemble everything from polyester to cashmere.

Thea Energy says that its planar-coil fusion power plant could be cheaper and easier to build thanks to AI-powered control software.

Microsoft's data center ambitions have imperiled its 2030 pledge to remove more carbon than it generates, making carbon removal credits all but necessary.