Perhaps the most controversial form of alternative energy after nuclear power is ___________.

A) hydropower
B) geothermal power
C) solar power
D) wind power
E) ethanol

Ethanol

A renewable fuel made from corn and other plant materials. It is blended with gasoline to increase octane levels and reduce emissions.

Alternative Energy

Energy sources that are considered alternatives to the traditional fossil fuels, such as solar, wind, and hydroelectric power.

Nuclear Power

The use of nuclear reactions to generate electricity, typically through the process of nuclear fission.