The ability to use geysers by humans.

As you know, geysers are very powerful. The geyser itself is a huge stream of hot water that rushes out from the bowels of the earth. The most efficient way to use a geyser is to generate electricity from them. It can also be used for its intended purpose, heating rooms with hot water. In the future, it is possible to start the reverse process, pump cold water into the bowels to get hot water. Iceland gets about 95% of its electricity from the energy of the geysers.