Renewable energy sources are cleaner and more environmentally friendly than fossil fuels. But you can't store wind or sun like you can oil or coal. Or can you?
Could coal, a carbon-rich fuel, be the key to fixing America's rising gas prices?
Scientist may have found another alternative source of energy. Learn about sustainable forest fuel on this Moment of Science.
Learn about alternative energy sources other than solar and wind power.
What are the pros and cons of a solar powered ride?