⑫relevant/'reləvnt/adj.有关的

　　be relevant to 与......相关，切题

　　⑬refer/rI'fɜː/(to)指，意即

　　⑭average adj.平均的；普通的，一般的

　　⑮in turn 依次　in return 作为回报

　　⑯lead to 引起，导致

　　⑰that, in turn, leads to ...是that引导的定语从句，修饰an average increase in the Earth's temperature。

　　⑱which trap heat from the sun ... 是which引导的定语从句，修饰先行词greenhouse gases。

　　⑲ray/reI/n.光线 ⑳bounce/baʊns/vi.反弹

　　\s\up1(21(21)Without ... gases是without引出的含蓄虚拟条件，the sun's rays would bounce ...是与现在事实相反的虚拟语气，其中leaving ...是现在分词短语作结果状语。

　　我们受得了这么热吗？

　　[第1～2段译文]

　　在过去的几十年里，科学家们一致认为，人类正在造成地球气候的变化--这是一种原来被认为是超出我们控制能力的现象。他们声称，在过去的50年里，工厂和车辆排入地球大气层中的气体加速了全球变暖的进程，影响了我们的气候。展望未来，科学家们认为全球变暖可能是21世纪面临的最严重的环境问题之一。但是，确切地说，什么是全球变暖？为什么把它视为一种危险？它如何与我们的生活相关呢？

　　全球变暖指的是地球温度平均增长，继而导致气候变化。科学家们发现地球的气温受温室气体如二氧化碳的控制，这些气体能将来自太阳的热量留在地球的大气层里。如果没有这些自然产生的气体，太阳光线将会被反射回太空中去，地球将处于寒冷之中，生命也就不可能在地球上存在。然而，当大气层中的这些气体的浓度不断增加时，更多的热量被留在地球，造成地球气温上升。

　　　　Over the last 100 years, the global average temperature has increased by 1°F and many experts insist\s\up1(22(22) that the blame for this global warming can mostly be pinned on\s\up1(23(23) human activities. As a result of\s\up1(24(24) increased industry, agriculture\s\up1(25(25)， the cutting down of forests, the increase in transport and the burning of fuels, nearly 6 tonnes of carbon dioxide goes into the atmosphere every year for every one of the Earth's 6 billion people. The amount of carbon dioxide in the atmosphere has risen by more than 30% in the last 250 years with half of this increase occurring since 1960. Given\s\up1(26(26) this data, it seems that the link between human activities and rising global temperatures is not merely a coincidence\s\up1(27(27).

A temperature increase of 1°F may not sound like a lot, but if we continue to produce carbon dioxide and other gases in such huge quantities\s\up1(28(28)， we are condemning\s\up1(29(29) life on Earth and should expect severe consequences\s\up1(30(30). Recent reports warned that global warming will cause