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As you know,My hometown looked like a heaven before it polluted by those dumn things.There were many green trees around the town.Fish swam in the limpid river.Simple buildings and the narrow street were full of people.The laborious people lived in poor.Nevertheless,we were happy and safe.We could breathed the fresh air,we could drink the fresh water.We lived in healthy and peace.However,as went by ,this town has change a lot.As the development of the economy,our town has become a big city.Industrialized society took cars and factories to our life,the pollution came along,too.Trees are discreasing day by day.More and more fish are killed by pollution.those things have made my hometown became a hell.We couldn't see birds fly in the sky anymore,the polluted air is damaging our health.In case we don't protect our environment right away ,we will regred in the future.So let's clean-up our own town.