Renewable Energy?

Who ever thought of such a thing? You can have energy, use energy, but you can not have "renewable energy"! Oh, it sound so perfect , doesn't it. You just have an energy source that is inexhaustable! So that you can continue to get energy from it? Just like having an oil well in your backyard! But the strange thing is that the people espousing the concept are people who want to sell you something. Like double paned window, insulation, solar water heating, solar electricity, etc., but never seem to be able to tell you where the renewable energy comes from. The energy on the earth comes from radioactive sources, which provide the heat to generate the life and death of the earth. Yes, the sun is radioactive, the earth is radioactive, and combined they generate the energy. But, it is not endless and can not be renewed after usage. You will have to pay , one way or another for the energy you consume!