Biomass is material of plants and animals that can be used for energy. This includes using wood from trees, waste from plants and manure from livestock. Biomass can be used to generate electricity, light, heat, motion and fuel. Converting biomass energy into useable energy has many environmental benefits. It uses waste materials that are usually dumped, and uses up methane (a greenhouse gas). Fuels such as ethanol can be made from biomass and used as an alternative to petrol to power motor cars.
Geothermal energy uses heat energy from beneath the surface of the earth.
Fast-flowing water released from dams in mountainous areas can turn water turbines to produce electricity.
Solar cells convert sunlight into electrical energy.
Electricity can be obtained by the flow of water through turbines in a dam as the tide rises and falls.
Moving air turns the blades of windmills or generators to make electricity or to pump water out of the ground.