Hurrah, we come to the end of the module! We started by talking about why governments are pushing people to use solar, and reduce the usage of petrol. One reason is that solar is a clean form of energy—it doesn't pollute the air.

Another important reason, as we saw in this module, is that solar energy is inexhaustible. We are not going to run out of solar energy for billions of years! Whereas, if we continue using petrol at the same rate, we will run out of it in just the next 50 years!