Transcript: Almost all of the world’s energy comes from non-renewable sources or fossil fuels. These energy sources took 300 million years to aggregate on the Earth, originating with solar energy and living organisms. We have significantly depleted them in only one hundred years. Modern energy usage is very inefficient; the United States wastes energy equivalent to $300 billion a year. The standard modes of energy use are also inefficient. An incandescent light is only five percent efficient, the internal combustion engine only ten percent efficient. However, clean and efficient energy sources do exist. They are cosmic fuels. The first is solar energy itself. Solar cell technology has now improved to the point where solar cells are about fifty percent efficient which is ten times more efficient than an incandescent light bulb. Fuel cells is the other possible technology. Fuel cells create energy from hydrogen, the ultimate cosmic fuel, the most abundant element in the universe and a clean energy source. Fuel cells are also approaching fifty percent in their efficiency.