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Natural energy from sources such as the sun, wind, and water is clean and renewable, unlike polluting fossil fuels. Solar energy is created by panels or heat collectors, while wind and hydroelectricity use natural forces. Fossil fuels are harmful and non-renewable, and their use contributes to environmental damage. The shift towards renewable energy is important for reversing this damage and instilling environmental values in future generations.
Natural energy is energy derived from natural sources, such as the sun, wind, water, and even the Earth itself. Many natural energy sources are clean and renewable, but not all. One of the most polluting forms of energy used by man, fossil fuel, comes from natural sources. In the 21st century, scientists and stakeholders around the world are strongly focused on shifting energy use from polluting sources of natural energy to clean-burning, sustainable forms, such as solar energy.
Solar energy can be created in two ways. Solar panels absorb sunlight, causing the light waves to interact with the electrons in the solar panel and create an electric current. Solar energy can also be used to heat things; by attaching a solar heat collector to pipes with circulating water, the heat from the sun will transfer to the water. Solar energy is natural, renewable and clean, which means it does little or no harm to the environment. It is regarded by many scientific experts as an important part of the shift towards clean, renewable natural energy.
Wind and hydroelectric energy sources both use natural forces to create energy. By placing wind turbines or windmills in constantly ventilated areas, the wind forces the turbines to spin, generating an electric current. Hydroelectricity often uses the enormous energy of falling water by creating a system of dams in which water falls from higher to lower heights, passing through turbines that create energy along the way. Both wind and hydroelectricity are very clean sources of energy, although some fear that water conservation could be a problem for hydroelectric resources.
Energy sources such as the sun, wind and water are all considered modern alternatives to fossil fuels. Since the 19th century, humans have relied on fossil fuels such as coal, gas and oil to power their homes, light lamps, run engines and fly planes. Unfortunately, fossil fuels are a very slowly renewing resource and are very harmful to the environment when burned.
Fossil fuels are created by the decomposition of organic plant and animal matter buried under rock and soil. The process of creating fossil fuels is extremely slow; some experts estimate that it takes about 300 million years to break down organisms into usable fuel. Due to human use, the Earth is running out of fossil fuels very rapidly. In addition, when fossil fuels are burned, they release carbon dioxide, nitrogen dioxide and other harmful chemicals into the environment, increasing levels of greenhouse gases and leading, according to many scientists, to global warming.
Renewable and clean natural energy allows humans to meet their energy needs without harming the environment. Since the 1970s, science, government and citizens have become increasingly aware of the need to shift research and development efforts to invent and perfect renewable energy systems. By switching to renewable and safe natural energy, many hope to reverse environmental damage over time and instill environmental values in future generations.
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