Grantham Foundation funds early-stage, scientifically difficult climate technologies—like direct air capture, advanced geothermal, and fusion—that mainstream venture capital often avoids, often providing the very first funding before an idea is proven. It runs through an unusual structure that combines foundation money, a public-charity investment vehicle, and shared governance with the CEOs of major environmental groups, and its climate focus grew out of the founders’ own travels seeing intact and destroyed ecosystems firsthand.