The Big Picture: Geologically active countries like Iceland can more than meet their needs with the energy that vents from the Earth, but other countries would benefit from expanding clean geothermal power as quickly as possible.
Where We Are Now: 10 GW
What We Need by 2050: 700 GW
For more on Iceland's geothermal bailout--a two-mile well drilled into a volcano--see our feature here.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.