thorium-based nuclear fuel, can’t blow up, can’t melt down, is more plentiful than uranium, doesn’t need to be enriched before using, less expensive than current power plants and very nearly idiot proof, even an eco freak could do it.
Perversely, the Left opposes thorium energy research because a side benefit permits the processing of nuclear waste from conventional nuclear plants. This removes the disposal issue from the Left’s quiver.