What is Renewable Energy? 

Renewable energy is produced harnessing the energy of the earth: solar energy uses energy from the sun; wind power uses energy from the wind, and hydropower harnesses energy from fast-flowing rivers. Because these renewable energy technologies do not put any new carbon into the atmosphere, they do not contribute to climate change. They are renewable because they do no run out as their supply is constantly being replenished. 

Biomass—the burning of plant materials for energy—may also be considered renewable energy if the burnt products are regrown. This is because the regrowth captures that carbon that has been released into the atmosphere by burning.