Pollution: Pollution is a hazardous gas or thing that can pollute the world and make it smell like gas and other thing. Pollution can include, gas leaks, garbage leaks, bad air, and water leaks. In this picture, you can see that there is smoke coming out of these pipes and that causes the air to pollute and when we breathe, we might be breathing this kind of air so it is really bad that this kind of pollution is happening to this one earth.