Renewable energy refers to energy sources that are replenished naturally and do not deplete over time. Some common forms of renewable energy include:

1. Solar energy: Solar energy is produced by capturing the energy from the sun’s rays using solar panels. This energy can be used to generate electricity, heat water, and power appliances.
2. Wind energy: Wind energy is produced by harnessing the power of the wind using wind turbines. This energy can be used to generate electricity and power homes, businesses, and other facilities.
3. Hydroelectric energy: Hydroelectric energy is produced by harnessing the power of falling water to generate electricity. This energy can be produced using dams, waterfalls, and other natural water sources.
4. Geothermal energy: Geothermal energy is produced by harnessing the heat produced by the Earth’s core. This energy can be used to generate electricity and heat buildings.
5. Biomass energy: Biomass energy is produced by using organic materials, such as wood, agricultural waste, and landfill gas, to generate electricity and heat.
6. Biofuels: Biofuels are fuels that are produced from renewable plant or animal matter, such as corn, soybeans, or algae. They can be used as a replacement for fossil fuels in transportation, such as gasoline or diesel.
7. Tidal energy: Tidal energy is produced by harnessing the energy of the tides in the oceans. This energy can be used to generate electricity using tidal turbines or barrages.
8. Wave energy: Wave energy is produced by harnessing the energy of ocean waves. This energy can be used to generate electricity using wave energy converters.
9. Thermal energy: Thermal energy is produced by harnessing the heat produced by the Earth’s surface, such as geysers or hot springs. This energy can be used to generate electricity or heat buildings.
10. Nuclear energy: Nuclear energy is produced by splitting the atoms of certain elements, such as uranium, to release energy. This energy can be used to generate electricity. Although nuclear energy is not a renewable energy source, it does produce low levels of greenhouse gas emissions and can be a clean and reliable source of electricity.

These renewable energy sources are generally considered to be more sustainable and environmentally friendly than non-renewable energy sources, such as coal, oil, and natural gas, which are finite resources that can contribute to air pollution and climate change.