Thereismuchmorepollutionandtheairisn'tcleaner.Lotsoftreearecutdowneveryyear.Weevencan'tseefishinsomerivers.Ourearthisindangersowemustsveourearth.We'dbettersavewater,reusethepaper,recyclethethingsandsoon.Weshouldpickuptherubbishandputitintothedustbin.It'sagoodideatoplantmoretreesinsping.Ifeveryonemakesacontributiontoourearth,itwillbecomemoreandmorebeautiful.