求空气污染的英语四级作文 air pollution 120个字左右

1.
Air pollution is one of the major problems of the modern world.A great deal of energy is needed to run the factories of modern industrial nations.Automobile,trains,planes and busses need energy,too.Nearly all of this energy is produced by burning fuels.The burning produces wastes,some of which remain in the air,causing air pollution.
Scientists are finding ways to stop air pollution especially in big industrial areas and densely-populated cities.They are studying new ways of generating electricity that may be less damaging to the environment.In the meantime,many power plants are being modernized to give off less polluted material.Also,engineers try to design and locate new power plants to do minimum damage to the environment.
However,it may be that we still have a long way to go before we have a "clean" world.Nearly all of the countries are trying hard to prevent and control air pollution.There indeed seems to be no end to tasks that environmentalists will be required to do.People will continually find new ways to control pollution.
2.
The impact of air pollution on climate
Air pollution is now discussing how they affect climate.The most serious air pollution is generated by burning:the burning of sulfur in coal and oil,will produce sparse oxides; air to participate in high-temperature reaction,will produce nitrogen oxides; will produce incomplete combustion of hydrocarbons and carbon monoxide; while combustion of pyrolysis gasoline,but also release lead; ....However,even the cleanest fuel combustion will produce carbon dioxide.Of course,the animal's breathing process,the same release carbon dioxide,and that of carbon dioxide into the atmosphere,about 80% came from breathing,only 20% from fuel combustion.However,the burning destroyed the natural balance of carbon dioxide,so that the concentration of atmospheric carbon dioxide increased year by year,which may cause the "greenhouse effect",so that the earth's rising temperatures.
Turbidity current growth rate of the Earth,or even greater than the concentration of combustion caused by cO2 growth rate,therefore,atmospheric turbidity will influence the Earth's climate can not be ignored.The increase in turbidity over the world there are many reasons,such as fuel consumption increase,fuel increase in agricultural machinery,mechanized farming,and so an increase in Young earth.
In addition to the greenhouse effect and atmospheric turbidity may affect the Earth's climate,other factors such as sunspot activity,etc.,to some extent also affect the Earth's climate.Sunspot activity since 1900 are constantly increasing.As the sunspot can increase the amount of solar radiation and thus cause rising temperatures.
The air pollution on the Earth's climate,they are not scientifically conclusive evidence on the.Most of was a bold extrapolation.