Supervolcanos and geothermic power
Ok, make sure your eyeballs are well lubricated because I don't want anyone to get hurt rolling dry eyes:
NASA has been thinking about how to tap the Yellowstone caldera for geothermal power and save us all from the inevitable extinction event when Yellowstone finally explodes.
It's a great idea, and incidentally it gives me a clue about an event in a story I'm got in a drawer. I knew somebody was experimenting with geothermal energy and it went horribly wrong, but I didn't know WHY they were doing it. Now I know why they were doing it, and why it went horribly wrong! --But it will be a long, long time before I can get back to that piece of work.