A view of city lights on Earth at night from space. • Humanity may face an energy crisis as the world's population rapidly grows. • Nuclear power plants can generate bountiful, carbon-free electricity, but their solid fuel is problematic, and aging reactors are being shut down. • A Cold War-era liquid-fueled reactor design could transform thorium — a radioactive waste from mining — into a practically limitless energy source.

• US engineers proved such a system works during the 1960s. However, the military canceled the project and it was nearly forgotten. • Companies and governments are now trying to revive and evolve the design, but development costs, engineering challenges, and nuclear-weapons concerns all pose hurdles. The lifeblood of modern civilization is affordable, free-flowing energy.

It gives us the power to heat our homes. Grow and refrigerate food. Purify water. Manufacture products. Perform organ transplants.

Or procrastinate from work by reading a story about the future of energy. Today's cheap, bountiful supplies make it hard to see humanity's looming energy crisis, but it's possibly coming within our lifetimes.

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Our numbers will grow from to, an increase of 22%. Rapidly developing nations, however, will supercharge global energy consumption. Fossil fuels could quench the planet's deep thirst for energy, but they'd be a temporary fix at best. Known reserves within a century or two. And burning up that carbon-based fuel would accelerate climate change, which is already on track to disrupt and jeopardize countless lives. Meanwhile, renewable energy sources like, though key parts of a solution, are — especially if the world is to meet a 2050 deadline set by the. Energy from is, but it's not yet proved to work, let alone on a commercial and competitive scale.

Nuclear reactors, on the other hand, fit the bill: They're dense, reliable, emit no carbon, and — contrary to bitter popular sentiment — are among the on earth. Today, they supply about of America's energy, though by the 2040s, this share may drop to 10% as companies shut down decades-old reactors, according to released by Idaho National Laboratory (INL).