Air is the most important thing to survive.We can survive maximum 1 to 2 days without water and 8 to10 days without food but we can't survive even 2 to 3 minutes without air.Today it is getting polluted due to a number of reasons.In order to save environment we need to stop it and the simplest way is to save environment is to plant more and more trees and ask people to stop deforestation.Trees will help in maintaining the balance of the atmosphere.