By this time next decade, you could be reading this story on a phone charged by fusion power, the same energy source that fires the sun.
There's no guarantee that future will arrive on time or at all. Fusion reactions have proved notoriously difficult for humans to sustain, despite some companies trying since the 1990s. But a recent surge in technology improvements and investment has delivered steady progress -- and optimism the environmentally friendly technology is within reach.
Image: The Joint European Torus is a fusion reactor with the doughnut-shaped tokamak design. JET