For decades, nuclear energy has been treated as the black sheep of the energy universe thanks to major drawbacks including high costs, high-profile nuclear accidents and hazardous by-products of nuclear energy production. Currently, there are thousands of metric tons of used solid fuel from nuclear power plants worldwide and millions of liters of radioactive liquid waste from weapons production sitting in temporary storage containers, some of which have begun leaking their toxic contents. Nuclear waste is notorious for the fact that it can remain dangerously radioactive for many thousands of years. Thankfully, the world has just come closer to finding a permanent solution to its nuclear menace: Finland has built the world’s first deep-earth repository where it will bury nuclear waste for 100,000 years starting 2026.