Unit4GlobalwarmingSectionⅠ课件（新人教版选修6）.ppt

Do you know what effects global warming have on penguins? What can we do to reduce global warming to protect them? Please read the following passage to get the answer.; Antarctica, the coldest place on Earth, is too cold for most humans. It’s a different story for penguins, though. Several types of penguins make their home in Antarctica.The birds walk with short steps all over the icy continent. However, they don’t all have “happy feet”. Some of Antarctica’s penguins are endangered. The animals hunt for food in waters off Antarctica’s coasts.They use floating sea ice as a place to rest while they search. In recent years, global warming, the slow rise of Earth’s temperature, has been causing the ice to melt.; “Global warming is reducing the amount of food for penguins so that they can’t find enough to eat，” scientist Shaye Wolf said. Turning up the heat Humans may be directly responsible for the continent’s temperature changes, according to a new study in the journal Nature Geoscience.Temperatures in Antarctica usually do not go above freezing, or 32 degrees Fahrenheit. But lately the weather has been heating up.; People add to global warming when they drive cars or use electricity. That burns fossil fuels, such as coal, oil, and natural gas. The burning of fossil fuels gives off gases that warm Earth. The harmful gases stay in the atmosphere above Antarctica, researchers say. They found that the west side of the continent is especially affected by global warming.; Scientists are concerned about the possibility that Antarctica’s ice may melt more over time. The icy continent is about 5 million square miles. It is covered by glaciers and an ice cap(冰冠)about 7,100 feet thick. If the ice melts, that could cause sea levels to rise around the world. Higher sea levels could lead to dangerous flooding in some countries.;Cool fix for Antarctica Experts are hopeful that conditions in