8模块八课文原文(2020年整理).pptx
相关主题
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
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 dioxide 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 of these gases in the atmosphere incwk.baidu.comease, however, more heat is trapped and the Earth's temperature rises.
Unit 22 Lesson 1 Global Warming
Can we take the heat?
In the last few decades, scientists have reached consensus and reported that human beings are causing changes in the Earth's climate – something previously seen as beyond 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 ahead, scientists believe that global warming could be one of the biggest environmental problems facing the 21st century. But what exactly is global warming, why is it seen as a danger, and how is it relevant to our lives?
A temperature increase of 1ЎF may not sound like a lot, but if we continue to produce carbon dioxide and other gases in such huge quantities, we are condemning life on Earth and should expect severe consequences. Recent reports warned that global warming will cause terrible climate changes including more frequent flooding, heat waves and droughts. Serious diseases will spread and industries that rely on nature such as fishing will be badly affected. Increased temperatures will also cause the polar ice to melt, raising sea levels and flooding many islands and cities. How can we stop these disasters from happening?
Over the last 100 years, the global average temperature has increased by 1°F and many experts insist that the blame for this global warming can mostly be pinned on human activities. As a result of increased industry, agriculture, 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 this data, it seems that the link between human activities and rising global temperatures is not merely a coincidence.
Unit 22 Lesson 1 Global Warming
Can we take the heat?
In the last few decades, scientists have reached consensus and reported that human beings are causing changes in the Earth's climate – something previously seen as beyond 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 ahead, scientists believe that global warming could be one of the biggest environmental problems facing the 21st century. But what exactly is global warming, why is it seen as a danger, and how is it relevant to our lives?
A temperature increase of 1ЎF may not sound like a lot, but if we continue to produce carbon dioxide and other gases in such huge quantities, we are condemning life on Earth and should expect severe consequences. Recent reports warned that global warming will cause terrible climate changes including more frequent flooding, heat waves and droughts. Serious diseases will spread and industries that rely on nature such as fishing will be badly affected. Increased temperatures will also cause the polar ice to melt, raising sea levels and flooding many islands and cities. How can we stop these disasters from happening?
Over the last 100 years, the global average temperature has increased by 1°F and many experts insist that the blame for this global warming can mostly be pinned on human activities. As a result of increased industry, agriculture, 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 this data, it seems that the link between human activities and rising global temperatures is not merely a coincidence.