Elements of nature occurring naturally without need for reproduction are called considered Natural Resources.  Wind, water, and the sun are great examples.  Understanding how natural resources can be used as energy sources can assist in creating a greener planet.  Natural Resources are a key agent necessary to help reduce energy consumption, reliance on non-renewable resources for all manner of uses and in providing cleaner energy.  In addition to this category, we also have  categories devoted to specific natural resources, which go in to greater detail about their uses.