1
Gases like carbon dioxide, methane, and nitrous oxide that remain in the earth´s atmosphere , causing a warming effect on the earth´s surface.
2
A renewable energy source that uses the force of water to generate electricity.
3
Types of combustible material that were formed in the earth long ago from plant and animal materials. Examples are oil, coal and natural gas.
4
A renewable energy source that uses the heat from within the earth to produce steam and hot water.
5
A renewable energy source that comes from plants or animal materials , including waste ans sewage.
6
A biofuel produced from corn or sugar cane that burns cleaner than regular gasoline.
7
A renewable energy source that uses the light from the sun to generate electricity.
8
A renewable energy source that uses the movement of air, often using turbines with propellers, to generate electricity.
