large stationary tracking mirrors concentrating sunlight to a central point colorless, odorless, flammable gas present in natural gas and formed by the decomposition of plant matter a fuel made from corn and wheat that is used like gasoline but is a renewable resource Hydrogen gas or the chemical mixture of hydrogen and oxygen used to produce electricity an example of an energy-efficient vehicle; uses a small, efficient gasoline engine most of the time, but also uses an electric motor when extra power is needed electronics that are off, but still use energy

1. heliostats

large stationary tracking mirrors concentrating sunlight to a central point

2. methane

colorless, odorless, flammable gas present in natural gas and formed by the decomposition of plant matter

3. ethanol

a fuel made from corn and wheat that is used like gasoline but is a renewable resource

4. hydrogen fuel

Hydrogen gas or the chemical mixture of hydrogen and oxygen used to produce electricity

5. hybrid car

an example of an energy-efficient vehicle; uses a small, efficient gasoline engine most of the time, but also uses an electric motor when extra power is needed

6. vampire electronics

electronics that are off, but still use energy.