8模塊八課文原文

1、Unit 22 Lesson 1 Global WarmingCan we take the heat?In the last few decades, scientists have reached consensus andreported that human beings are causing changes in the Earth's climate - something previously seen as b

2、eyond our control. They claim that in the last 50 years, gases pumped into the Earth's atmosphere by the factories and vehicles have been speeding up the process of global warming and affecting our climate. Looking a

3、head, scientists believe that global warming could be one of the biggest environmental problems facing the 21stcentury. But what exactly is global warming, why is it seen as a danger, and how is it relevant to our lives?

4、Global warming refers to an average increase in the Earth's temperature that, in turn, leads to climate change. Scientists found that the temperature of the Earth is controlled by greenhouse gases such as carbon diox

5、ide which trap heat from the sun in the Earth's atmosphere. Without these naturally occurring gases, the sun's rays would bounce back into space leaving the Earth cold and impossible to live on. When the presence

6、 of these gases in the atmosphere increase, however, more heat is trapped and the Earth's temperature rises.Over the last 100 years, the global average temperature has increased by 1°F and many experts insist th

7、at the blame for this global warming can This is no easy task, however, and some governments, for example, the USA'sfederal government, express reservations about whether global warming isreally caused by human activ

8、ities.Many people believe that they are simply not prepared to sacrifice the amount of money they make from industry to save the Earth. But whywait around for governments to take action? Experts advocate that each person

9、 play their part. They suggest making small changes like taking public transport, recycling, using low-flow shower heads, and buying light bulbs that use less energy. Even simple things like using recycled paper or switc

10、hing off the lights when you leave a room can help. If we add up all these small changes made by everyone worldwide, they won't be such small changes. They could be the changes that save our future.Afterall, there