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2017年12月英语四级美文:Hotter or Colder ?

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  2017年12月英语四级美文100篇汇总

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  Hotter or Colder ?

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  It was once thought that air pollution

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  affected only the area immediately around large cities

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  with factories and/or heavy automobile traffic.

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  Today, we know that although these are the areas

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  with the worst air pollution,

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  the problem is literally worldwide.

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  On several occasions over the past decade,

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  a heavy cloud of air pollution

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  has covered the entire eastern half of the United States

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  and led to health warnings even in rural areas

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  away from any major concentration of manufacturing

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  and automobile traffic.

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  In fact, the climate of the entire earth

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  may be affected by air pollution.

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  Some scientists feel

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  that the increasing concentration of carbon dioxide in the air

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  resulting from the burning of fossil fuels

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  (coal and oil)

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  is creating a “greenhouse effect” —

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  holding in heat reflected from the earth

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  and raising the world’s average temperature.

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  If this view is correct

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  and the world’s temperature is raised only a few degrees,

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  much of the polar ice cap will melt

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  and cities such as New York, Boston, Miami,

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  and New Orleans will be under water.

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  Another view, less widely held,

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  is that increasing particulate matter in the atmosphere

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  is blocking sunlight and lowering the earth’s temperature —

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  a result that would be equally disastrous.

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  A drop of just a few degrees could create something close to new ice age

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  and would make agriculture difficult

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  or impossible in many of our top farming areas.

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  At present we do not know for sure

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  that either of these conditions will happen

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  (though one recent government report

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  prepared by experts in the field concluded

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  that the greenhouse effect is very likely).

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  Perhaps, if we are very lucky,

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  the two tendencies will offset each other

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  and the world’s temperature will stay about the same

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  as it is now.

  2017年12月英语四级美文100篇汇总

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