We require different sources of energy to live and work. Solar, wind, geothermal and biomass are a few of the sources. In addition to being an important source of electricity, these sources can also be used for transport and heating. The biggest issue with these sources of energy is that they can create greenhouse gas emissions when they are burned to produce electricity. This means that there is a need for more sustainable sources of energy.
Fossil fuels are the most popular type of energy. They include oil, coal and natural gas. They formed millions of years ago when animals and plants of the past died and were covered by layers of sedimentary rock. Then, under the proper conditions, they slowly transformed into carbon-rich substances which, when burnt, generate energy. These fossil fuels are not renewable because they will run out in our lifetimes or in a number of lifetimes.
Renewable energy sources are replenished continuously. The sun is the most important source of renewable energy, since it supplies warmth and light. It is used to power our homes and businesses and to drive vehicles. Wind is an energy source that is renewable and generates electricity by spinning turbines. We have been using it since people first began to harness the wind for millennia. Finally, we use biological processes to create ethanol (a clear alcohol that can be used as a fuel) from waste and crops.
Hydropower is the main renewable energy source in the US, but biofuels and wind are likely to surpass it. Hydropower is based on nature’s water cycle to harness the power of swiftly flowing water, which is then used in turn to index generate electricity.
