Th most cutting-edge approach for saving the planet from climate disaster doesn’t sound like it’s ripped out of the pages of science fiction. In fact, it doesn’t even sound like it’s ripped from the headlines. Far from new but nonetheless noteworthy, the ancient energy technology of using heat from the Earth’s core is finally ready for its close-up. While geothermal energy is already used around the world in relatively small-scale operations, scientists are working on scaling what could potentially be a clean, abundant,…