Is this humanity's saving grace? The world is desperate for a solution to fossil fuels. And, if nuclear fusion can be performed successfully and safely, it would be able to generate a constant stream of energy and simplify our path to zero-emissions electricity and keep society as we know it humming. Nuclear fusion has had its fair share of challenges and concerns, with the technical complexity and massive costs repeatedly hardening the stance of nuclear fusion sceptics. However, after decades of disappointment, things look like they're about to change. James Temple examines the ins and outs of modern nuclear fusion and analyses the latest progress scientists have made in making it a possibility.