Currently, our planet gets most of its power from coal, oil and gas. These called fossil fuels were formed from plants and animals that lived hundreds of millions of years ago and became buried way underneath the Earth’s surface. Most of the energy we use comes from fossil fuels and the problem is fossil fuels are non-renewable which are gradually running out. They are limited in supply and will one day be depleted. There is no escaping this conclusion. If we want to carry on living our lives in much the same way, we need to rely on renewable energy.