Clean energy

Clean energy refers to energy sources and technologies that produce little to no air pollution or greenhouse gas emissions.

What is nuclear fusion — and are we finally close?

A glowing artificial sun inside a futuristic reactor, representing nuclear fusion and the attempt to create star-like energy on Earth.

Nuclear fusion is the dream machine of energy: no smokestack, no coal train, no ordinary reactor fuel rods, just light atoms squeezed so hard they snap together and spill out astonishing energy. The twist is that fusion is both real and not ready. Scientists have crossed major milestones, but a lab triumph is not the same thing as cheap electricity on your wall socket. Here’s the simple version, without the fog.