Not far below the surface, our earth is hot. This heat can be used to efficiently heat water and generate electricity.
Our earth's internal heat is a virtually endless source of clean energy. This particular energy source is referred to as geo-thermal energy. The word derives from ancient greek, with "geo" for "earth" and "therme" for "heat".
Also check out our current news on geothermal energy. You might also want to have a look at the sources offering geothermal and renewable energy jobs across the globe.