大学英语四级听力考查考生的迅速信息提取能力。通过反复练习听力材料，积累高频词语，可以提高对不同场景的理解，迅速抓住重点信息。以下是“2025年12月大学英语四级短文听力原文：Hotter or Colder ?”，期望给大伙学习带来帮助。
2025年12月大学英语四级短文听力原文：Hotter or Colder ?
It was once thought that air pollution affected only the area immediately around large citieswith factories and/or heavy automobile traffic.
Today, we know that although these are the areas with the worst air pollution, the problem isliterally worldwide.
On several occasions over the past decade, a heavy cloud of air pollution has covered theentire eastern half of the United States and led to health warnings even in rural areas awayfrom any major concentration of manufacturing and automobile traffic.
In fact, the climate of the entire earth may be affected by air pollution.
Some scientists feel that the increasing concentration of carbon dioxide in the air resultingfrom the burning of fossil fuels is creating a “greenhouse effect” — holding inheat reflected from the earth and raising the worlds average temperature.
If this view is correct and the worlds temperature is raised only a few degrees, much of thepolar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will beunder water.
Another view, less widely held, is that increasing particulate matter in the atmosphere isblocking sunlight and lowering the earths temperature — a result that would be equallydisastrous.
A drop of just a few degrees could create something close to new ice age and would makeagriculture difficult or impossible in many of our TOP farming areas.
At present we do not know for sure that either of these conditions will happen .
Perhaps, if we are very lucky, the two tendencies will offset each other and the worldstemperature will stay about the same as it is now.
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