From fuel source to size, here's what you need to know.

In fact, there has been some research recently into using it as a fuel source.

There are several other fuel sources available that can help meet our needs.

It was used as a source of fuel for the winter and, throughout the summer.

Both wood and gas may be used as fuel sources.

Maybe they intend to use the energy as a fuel source.

Some is used as source of fuel at the platforms.

They were designed to be able to use both coal and oil as fuel sources.

Automobiles with more than one fuel source may become the standard.

And no fuel source is free from the effects of rising demand around the world.