Different energy sources supply us with the power we require to live and work. Solar, wind, geothermal and biomass are just a few of the sources. These sources aren’t just major sources of electricity, but they can also be used for heating and transport. The main challenge for these energy sources is that they may cause greenhouse gas emissions when used to generate electricity. This is why there is a need for more environmentally sustainable energy sources.

Fossil fuels are the most well-known form of energy. They include coal, oil and natural gas. They began to form millions and millions of years ago when animals and plants of the past died and were covered by layers of sedimentary rock. Under the right conditions these fossil fuels slowly transformed into carbon-rich materials that, when burned produce energy. These fossil fuels cannot be recycled as they will run out in our lifetimes or in a number of lifetimes.

Renewable energy sources, on the other hand, are continually replenished. The most important renewable energy source is sunlight, which supplies heat and light. It is used for our homes as well as for businesses and automobiles. Wind is another renewable energy source, which generates electricity through spinning turbines. We have been using it since people first began to harness the wind for millennia. We use biological processes create the ethanol (a clear, alcohol-like substance that can be used as fuel) from food waste and crops.

Among these sources hydropower is the biggest renewable energy source in the United States, though wind and biofuels are expected be the next to take over. Hydropower makes use of the natural water cycle to harness the power of water’s rapid flow, which in turn produces electricity.

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