Clean energy sources are those that do not produce harmful emissions. They have many uses, including lighting, heating, and electricity generation. Although some energy sources are more environmentally friendly than others, all are clean by definition.
Clean energy can come from natural resources such as wind and solar power. These sources are safer than fossil fuels.
Fossil fuels, however, are harmful to the environment and human health. Some examples of non-renewable energy sources include coal, oil, and natural gas. All of these have short-term effects on our health and climate.
The Energy Information Administration (EIA) keeps track of emissions from all of these sources. Natural gas and solar power emit less air pollutants than other fossil fuels.
Hydropower is another renewable energy source. It has been used for years to irrigate crops, grind wheat, and automate manual tasks. However, large hydroelectric dams can be damaging to the environment.
Nuclear energy is another alternative. Unlike other forms of energy, nuclear does not release harmful byproducts. In addition to not producing greenhouse gases, it is extremely efficient.
Renewable energy sources can also be combined with other energy sources to reduce the use of fossil fuels. This combination helps to keep the electrical grid stable.
Although not completely clean, biogas is a type of renewable energy. Biogas is made when natural organic materials are burned. On combustion, biogas releases carbon dioxide into the atmosphere.
Fracking is a process that extracts natural gas from rock. There are several issues with fracking, such as earthquakes and water pollution.