最新版高中英语课时讲练通配套课件：Unit4《Global warming》（新人教版选修6）.ppt

金太阳新课标资源网金太阳新课标资源网 wx. wx. 最新版高中英语课时讲练通配套课件: Unit4 《 Global warming 》(新人教版选修 6) 金太阳新课标资源网金太阳新课标资源网 wx. wx. There will be no safety for human on the earth Nowadays global warming isn ’ t just an opinion. It ’ s a scientific reality. The science tells us that human activity has made enormous impacts on our that affect our well-being and even our survival as a species. 金太阳新课标资源网金太阳新课标资源网 wx. wx. The world ’ s leading science journals report that glaciers are melting ten times faster than previously thought, that atmospheric greenhouse gases have reached levels not seen for millions of years, and that species are vanishing as a result of climate change. They also report on extreme weather events, long-term droughts, and rising sea levels. Fortunately, the science also tells us how we can begin to make significant repairs to try and reverse those impacts, but only through immediate action. 金太阳新课标资源网金太阳新课标资源网 wx. wx. What is Global Warming? The Earth as an ecosystem is changing, attributable in a great part to the effects of globalization and man. More carbon dioxide is now in the atmosphere than has been in the past 650, 000 years. This carbon stays in the atmosphere, acts like a warm blanket, and holds in the heat — hence the name is “ global warming ”. 金太阳新课标资源网金太阳新课标资源网 wx. wx. The reason we can exist on this is that the earth naturally traps just enough heat in the atmosphere to keep the temperature within a very narrow range — this creates the conditions that give us breathable air, clean water, and the weather we depend on to survive. Human beings have begun to tip that balance. We ’ ve overloaded the atmosphere with heat- trapping gases from our cars and factories and 金太阳新课标资源网金太阳新课标资源网 wx. wx. power plants. If we don ’ t start fixing the problem now, we ’ re in for devastating chang