The pollution is produced by the humans: the humans contaminate working in factories, driving their own cars, throwing waste away and doing many other bad things.
The pollution consists of the contamination of the atmosphere and it’s very bad to our lives. It also consists of the accumulation of waste in the Earth.
Nowadays it is impossible to stop the pollution, but we can do good things to make the world a better place. For example I can use a solar calculator; I can also contribute walking instead of travelling by car for short distances.