Sustainable Building Forum

GeoThermal energy is another use of the Sun's radiant energy.  Just because we're not turning solar rays directly into energy doesn't mean GeoThermal is not making use of the same energy.

As an example, think of a GeoThermal heating and cooling system.

Well?

Another energy from the sun is the movement of the sea level ... because of the gravity of the sun & the moon. There is a constant motion in the sea, you can use this energy to create a 'perpituum mobile' like a "dynamo" you take more energy out of it, than you need to create the movement. It's like rotating blades of wind-energy but using the sea/water instead of the wind.

Eventually, specific areas can cool down, and there's really no way to "reheat" the earth. There is also concern that where geothermal energy is used for large projects, such as power plants, that the method that's commonly used of injecting superhot water back into the lands can adversely affect the stability of the region.

To put it simply: It's taken millennia for the earth to store all that solar energy. If you use up all that heat in a few decades, there's no telling what the long term consequences will be. We're much better off eliminating the middleman and harnessing solar power directly.

Very good point about geothermal energy not being renewable...but what about wind energy?