How does reusing a plastic help earth?

when you recycle the earth becomes more clean, and there are less trash, and the air is more cleaner than it was, with clean air there are no pollutions so when you go for a jog and smell something nasty that's bad for your lungs and heart because of the chemicals that are really TOXIC might effect your heath, just like smoking but its from the people around you so if you recycle your world is better!!!! :)