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Most scientists are now certain that global warming is taking place. Gases such as carbon dioxide are creating a warm blanket around the earth. This blanket is trapping heat in the atmosphere, and so raising the temperature of the earth.

In Europe, eight of the last ten years have seen record high temperatures. On the other hand, the countries around the Mediterranean Sea are receiving even less rain than before. In Sub- Saharan Africa the crops are drying out in the fields and people are dying of starvation. In 1999, the southern United States was struck by a serious of destructive(毁灭性的) hurricanes. Scientists expect such trends to continue, and to worsen, if global warming cannot be stopped.

In addition to worrying about rising global temperatures and extreme weather conditions, scientists are closely monitoring sea levels around the world. They are slowly rising, as the northern and southern polar ice caps start to melt. This will have serious consequences for low-lying countries near the sea. Already parts of these places are disappearing under the rising sea water.

According to a new research, one contradictory feature(特征) of global warming is that it will probably lead to a period of much colder weather. Scientists base their theory on what happened the last time the world warmed up, 8,300 years ago. They have discovered that when the ice melted from the northern polar ice cap it became trapped in a lake in northern Canada. As more ice melted, this lake suddenly burst open, pouring millions of tons of freezing fresh water into the North Atlantic. This flood of water prevented the normal flow of water in the Atlantic, which takes warm water from the tropics(热带地区) north to Europe. When this flow of warm water was cut off, temperatures in Europe dropped by between three and eight degrees over the next 200 years. ''That's the concern here,'' says Richard Alley, an American climate expert. ''The climate hasn't varied much in 8, 000 years. But big changes could come back!''

大多数科学家现在都确信全球变暖正在发生。二氧化碳等气体正在地球周围形成一层温暖的毯子。这层毯子将热量截留在大气中，从而提高了地球的温度。

在欧洲，过去十年中有八年出现了创纪录的高温。另一方面，地中海沿岸国家的降雨量比以前更少。在撒哈拉以南非洲地区，农作物正在干涸，人们正在死于饥饿。1999年，美国南部遭受了一场严重的破坏性地震(毁灭性的) 飓风。科学家们预计，如果不能阻止全球变暖，这种趋势将继续下去，并将恶化。

除了担心全球气温上升和极端天气条件外，科学家们还在密切监测世界各地的海平面。随着南北极冰盖开始融化，它们正在缓慢上升。这将对近海低洼国家造成严重后果。这些地方的一部分已经在不断上涨的海水下消失了。

根据一项新的研究，一个矛盾的特征(特征) 全球变暖的原因是，它可能会导致一段时间的天气更加寒冷。科学家们的理论基于8300年前世界上一次变暖时发生的事情。他们发现，当北极冰盖上的冰融化时，它被困在加拿大北部的一个湖中。随着更多的冰融化，这个湖突然裂开，将数百万吨冰冻的淡水注入北大西洋。这股洪水阻碍了大西洋的正常水流，大西洋从热带地区带走了温水(热带地区) 北至欧洲。当这种温暖的水流被切断时，欧洲的温度在接下来的200年里下降了3到8度。”美国气候专家理查德•艾黎（RichardAlley）说，这正是人们关心的问题8000年来气候变化不大。但大的变化可能会回来！”

句子成分分析：

This blanket is trapping heat in the atmosphere, and so raising the temperature (of the earth).

句子语法结构详解：

* trapping 为谓语，采用现在进行时。
* raising 为谓语，采用现在进行时。
* is 为助动词。the 为定冠词。

句子相关词汇解释：

Vocabulary:

句子成分分析：

In 1999,the southern United States was struck [by a]serious[of destructive] hurricanes.Scientists expect such trends to

continue, and toworsen, || if global warming cannot be stopped.

句子语法结构详解：

(struck 为 strike 的过去分词。cannot = can not)

* struck 为谓语，采用一般过去时和被动语态。
* expect 为谓语，采用一般现在时。
* to continue 为不定式，作宾语补足语(或称复合宾语)。
* to worsen 为不定式。
* if 为连词，引导条件状语从句。
* stopped 为谓语，采用被动语态。
* can 为情态动词。was, be 为助动词。the 为定冠词。a 为不定冠词。

句子相关词汇解释：

Phrase:

Vocabulary:

句子成分分析：

''That's the concern [here],''says Richard Alley, an American climate expert.''The climate hasn't varied [much] in 8, 000 

years.But big changes could come back!

句子语法结构详解：

(That's = That is, hasn't = has not)

* is 为系动词作谓语，采用一般现在时。
* varied 为谓语，采用现在完成时。
* come 为谓语。
* can 为情态动词。that 为指示代词。has 为助动词。the 为定冠词。an 为不定冠词。

句子相关词汇解释：

Phrase:

Vocabulary:

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