Renewable energy sources are energy sources that are always being replaced. They can never be exhausted.

Because renewable energy sources such as solar and wind do not radiate carbon dioxide and other greenhouse gases that subsidize to global warming.

There are five major renewable energy sources

• Solar energy from the sun.
• Geothermal energy from heat inside the earth.
• Wind energy.
• Biomass from plants.
• Hydropower from flowing water.