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Finally a ray of good news concerning the environment, NASA scientists say ozone depletion is going down.
美国国家航空航天局最终发布了一条关于环境的好消息,科学家们表示臭氧的消耗在逐渐降低。
The ozone layer is a protective gas in the atmosphere that shields earth from harmful ultraviolet rays from the Sun.
臭氧层是大气中一种保护气体,保护地球免受太阳辐射的有害紫外线。
This is the source of the good news.
这就是好消息的来源。
And NASA satellite that monitors the hole in the ozone layer, which was first detected at the end of the 1970s.
并且美国国家航空航天局用来监测臭氧空洞的人造卫星在20世纪70年代末期首次监测到空洞。
That’s what we’re excited about.
那是让我们兴奋的地方。
It’s that we see for the first time chlorine levels are definitely going down, and ozone levels are responding to it.
人们首次发现氯的含量确实在降低,而臭氧含量也在相应增加。
Man-made chemicals called chlorofluorocarbons or CFCs left chlorine in the atmosphere that destroyed ozone molecules.
被称作氯氟碳或者氯氟烃的人造化学物质,将氯释放到大气中破坏了臭氧分子。
The damage from the ozone layer has been blamed for an increase in skin cancers.
臭氧层的损坏导致了皮肤癌患者数量增加。
Because the harmful ultraviolet radiation that gets through.
因为有害的紫外线辐射穿过大气层。
And this is the effect it has on plants.
同样这对植物也有影响。
CFCs were found in products like aerosols, pesticide sprays, packing materials and refrigerants.
氯氟烃被发现存在于类似喷雾器,农药喷雾,包装材料和制冷剂这些产品中。
They were banned globally in 1987.
在1987年,全球禁止使用这些产品。
NASA has released images that showed the changing ozone concentrations since the CFCs were phased out.
美国国家航空航天局发出的图像显示了氯氟烃禁止使用之后的臭氧浓度变化。
The Montreal Protocol has been a great success.
《蒙特利尔议定书》取得显著成就。
Once the protocol was signed in those, the regulations went into effect.
一旦各国在议定书上签字,这些条例就开始生效了。
We saw at the surface levels of ozone depleting substances going down.
我们看到大气层表面的臭氧层物质的消耗量在降低。
The scientists wonder full recovery will take decades.
科学家猜想臭氧层完全恢复还需要几十年。
Because the CFCs could remain in the atmosphere for another fifty to a hundred years.
因为氯氟烃还会在大气中残留50到100年。

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Question:
When did NASA satellite first detected the hole in the ozone layer?
A  at the end of the 1970s
B  at the middle of the 1970s
C  at the beginning of the 1970s
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