The sun’s energy is the primary source of energy for all life on Earth. Energy changes form at each step in the chain. Humans and other organisms use energy to survive (grow, change, maintain health, move, and reproduce).

To heat our homes and schools we need an energy source. These energy sources can be categorised as renewable or non-renewable energy. Renewable energy is one that can be easily replenished while non-renewable is one that cannot. Examples of renewable energy include; solar, wind, geothermal, biomass and hydropower.