Fuel Cells-A Most Promising Alternative Source of Energy

Conversely, natural gas, coal, and oil, at some time in history, were alternative energy sources. An alternative energy source is a non-depleting or renewable energy source, and, for many it is this quality that creates much of the appeal. The burning of refuse has met with some environmental concerns and strict regulations. Recycling of some refuse materials such as paper and plastics has given an alternative to burning.