We need different energy sources to live and work. These include wind, solar geothermal, biomass, and geothermal sources. In addition to being an important source of electricity, these sources can also be used to heat and transport. These energy sources emit greenhouse gases when burned to produce electricity. This means that there is a need for more sustainable energy sources.
Fossil fuels are the most common form of energy. They include coal, oil and natural gas. They were created thousands of years ago, when prehistoric animals and plants died and were buried beneath layers of sedimentary rocks. Under the right conditions, these fossil fuels were gradually transformed into carbon-rich substances which, when burned, produce energy. These fossil fuels cannot be recycled since they will exhaust in our lifetimes or in many lives.
Renewable energy sources are replenished continuously. The primary renewable energy source is sunlight, which provides warmth and light. It is used for our homes as well as for businesses and automobiles. Wind is a different renewable energy source, which generates electricity by spinning turbines. Since the first people discovered how to harness the wind, we have been using it for millennia. We utilize biological processes to create an ethanol (a clear, alcohol-like substance that can be used for fuel) from food waste and crops.
Hydropower is the largest renewable energy source in the US, but biofuels and winds will soon surpass it. Hydropower draws on nature’s hydro cycle to harness the power of rapid-flowing water, which is then used in turn to generate electricity.
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