The energy crisis of the seventies on the United States by is one example. At the nuclear level, fusion and fission could both be the source of energy. Fission has the problem of relying on non-renewable resources like Uranium, and producing radioactive waste. Fusion, which powers the stars and does not make radioactive waste has not been mastered to the degree of a possible energy source on earth. One source of energy on the surface of the plant is that of wind.
Windmills can have an efficiency of about sixty percent.
Energy by Gordon Aubrecht, sites that 10,000 TkWh per year could be captured from the wind. This was twenty times the world energy used when the book was published in 1989. One possible way to avoid the land loss is to have offshore windmills, where wind is stronger. California is also one of the world'slargest manufacturers of solar cells. California accounts for roughly 30 percent of the world's production of solar cells.