Solar energy is radiant energy that is produced by the sun.
Wind is a clean and renewable energy resource which has no polluting emissions.
Bioenergy is stored energy from the sun contained in materials such as plant matter and animal waste, known as biomass.
Hydrogen is the simplest element on Earth.
Geothermal energy in its broadest sense is the heat stored within earth's crust.
CNG, or Compressed Natural Gas, is a gas which consists primarily of methane.