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Geothermal heating/cooling is a great way to regulate temperature inside buildings without using a massive amount of energy on the A/C system.
This is an example of what geothermal heating in a building would look like. The pipes are filled with a type of liquid that absorbs heat--so in the summer, unwanted heat is absorbed into the liquid and stored there. In the winter, the pipes draw heat from the earth around it to warm up the building.
It's possible for small amounts of money from the government to be used to install geothermal heating in widely used public facilities such as gyms, libraries, etc. It doesn't have to be a sudden, large-scale installation of geothermal energy all over the country. Seeing as California already offers tax incentives to homeowners who install geothermal energy, there is no reason other places in the country can't do the same.