If we continue to burn fossil fuels for energy at the current rate, they will last only another few hundred years. In the context of civilization, the fossil fuel era is drawing to a close. In addition, it would be wise to reduce our combustion of oil, gas, and coal because the process produces pollutants that are bad for our health and carbon dioxide that could change our climate in undesirable ways. One possible future source of electricity for the world is fusion energy.