Alternative energy

Describes the various kinds of bioenergy, ways we are using it today, and its advantages and disadvantages.

Explains how the Sun, which is the ultimate source of all energy on earth, can be used to provide electricity and power.

Describes the resurgence of water power, one of the oldest forms of alternative energy, and ways of using water as energy.

Explains how geothermal energy, natural heat from inside the earth, can be used as a source of heat or to provide electricity.

Discusses how today's modern wind turbines have developed from the windmills of the past and how technology relating to wind power continues to develop.