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The earth's core is very hot!  If we can tap into this renewable source of energy, we will be able to satisfy a large chunk of our energy needs while simultaneously cutting down emissions and pollution dramatically.

I didn't realize that there are three types of geothermal power plants. I have heard that this is a very intensive process, and the site even states that this process is not renewable in the traditional sense of the word. Nonetheless, it seems that this could be a very viable power source for many parts of the world.

This is another idea I have never heard of. It seems that using the geothermal energy stored by mine water to heat and cool buildings could be a viable energy source. However, is it safe? And couldn't it be considered a non-renewable resource?