By planting more trees.(Afforestation)
By using good fuel in the vehicles such as C.N.G(Compressed Natural Gas) because it does not produce any pollution in the ecosystem.
By throwing dust , garbage and polythene bags in the dustbins because in pollute the air/atmosphere.
By not cutting trees and giving punishment to those greedy peoples who cuts tree for the sake of money.
By avoiding the burning of fuels that produces harmful gases in the atmosphere.