The document discusses renewable and non-renewable energy sources such as wind, natural gas, and oil. Wind energy is renewable because the wind can be used over and over again, while natural gas is considered renewable because it is collected through pipes from underground reserves. Natural gas provides more energy than wind but also releases pollution into the air. Non-renewable energy sources like oil take millions of years to form from dead organisms and cannot be replenished. The conclusion states that wind is a better option than fossil fuels in order to reduce pollution.