This chapter will focus on renewable energy: what it is, how it works, what forms of renewable energy are currently available for use and which ones are on the horizon slated for use in the near future. We will examine each in turn: solar, geothermal, wind, hydropower, biofuels, and even secondary sources, such as electricity and hydrogen, in an effort to determine which direction humans need to take in order to protect the landscape and keep the environment as healthy as possible.