The predictions by the Department of Energy indicate the maximum of the rate of supply of oil will be reached around 2021, but this neglects the effect of the rapid growth of China and India. It will be necessary to use coal, natural gas, nuclear power, or renewables to supplement, and, after 2021, to replace oil. If coal is used, it can be reacted with steam to produce H[2], the burning of which produces only water. If nuclear power is developed, the 30% of nuclear energy at present wasted can be used to produce H[2]. Renewables are sporadic and need hydrogen as a storage means and for transmission.