Firstly ,air pollution,which has a bad effect on the environment,comes from factories,power stations and cars.Lots of factories take pollution to world .for example,In 1984 there was a serious accident at a factory in India and a cloud of dangerous gas covered the town of Bhopal.Over 2,500 animals were killed that night,Hundreds of thousands of animals were injured.Many of them injured lost their sight.Next,Chemicals in the smoke from power stations cause a lot of damage.They can travel hundreds of miles in the wind before falling to the ground as rain.Nevertheless this “chemical rain” gradually destroys trees in the forests and kills fish in lakes.In Germany,over 50% of the country's trees had been damaged by the year 1986.Last,Cars are a convenient transportation,but they also cause serious problems.All the time,they are pumping huge amounts of waste gases into the atmosphere.These gases,in turn,cause disease and even death.Therefore,it is urgent that the problems be solved.
