Renewable energy sources such as solar, wind, tidal, hydro, biomass, and geothermal have become significant sectors of the energy market. The rapid growth of these sources in the 21st century has been prompted by increasing costs of fossil fuels as well as their environmental impact issues that significantly lowered their use. Bolstering the supply from copper extraction is the fact that more than 30 percent of copper installed during the last decade came from recycled sources. Its recycling rate is higher than any other metal.