Unit4_Global_warming课件14(新人教版选修6）.ppt

Unit 4 Global Warming;Extreme heat 酷暑;;;fire;flood;hurricane /typhoon;I feel hot !;;The Earth is Becoming Warmer --But Does It Matter? 地球在变暖—— 要不要紧？;New Words and expressions; ;What are the two graphs about?;Careful Reading;; During the 20th century, the temperature of the earth didn’t seem to increase much. 2. There is no doubt that global warming is caused by the human activities. 3. Not all scientists believe that the increase in the earth’s temperature is due to the burning of fossil fuels.;4. The levels of carbon dioxide have increased greatly over the last 100—150 years. 5. George Hambley believes that global warming will do good to the earth. 6. We know the effects of global warming. ;How has global warming come about(产生)?;carbon dioxide;Have you ever seen a greenhouse?;Methane[mi:θein] ;Dr.Foster:_____________________ George Hambley:_________________ ;Does global warming matter?;cause the sea level to rise severe storms floods droughts famines the spread of diseases disappearance of species;;tornados;;destruction of species;cause the sea level to rise severe storms floods droughts famines the spread of diseases disappearance of species;Summary ;1. Human activities;cause the sea level to rise severe storms floods droughts famines the spread of diseases disappearance of species;Homework;