Solar and Wind Power

There is a selection of alternative green energy systems available. Each are deemed renewable and can produce electricity. However, they are not all equal in their impact on the environment. Some are considered more sustainable than others. Commentators have divided the various options into two types. Solar energy, wind energy and hydro energy form one group while so called ‘earthly sources’ like biofuels and geothermal energy, constitute the second group.

With environmental concerns as they are today, renewable energy is enjoying a time of heightened interest. Renewable energy can come from a number of sources such as wind, water, sunlight and heat from geothermal sources. Today, approximately 20% of the energy in the world comes from renewable sources. While most of this comes from burning wood a very large amount also comes from hydroelectricity.