英语全球变暖.pptVIP

Some species of wildlife could be greatly affected by global warming ? For example, polar bears ? require pack ice in order to hunt and live. ? If all pack ice disappears, they might eventually go extinct in the wild. ? Sea turtles ? breed on the same islands as they are born on. ? They could go extinct on some islands as beaches are flooded before new beaches are produced. ? Other species may go extinct as rainfall patterns change throughout the world. ? * Global Warming 1.What is global warming Global warming?is the gradual rise in the Earths temperature caused by high levels of carbon dioxide and other gases in the atmosphere. 2.What caused global warming Natural causes Greenhouse effect Human reasons Human activities-emission Greenhouse effect The so-called greenhouse effect is short wave solar radiation through the atmosphere into the ground, and warming the ground after the length of radiation being released in the atmosphere by absorbing carbon dioxide and other substances, thereby creating the effect of atmospheric warming. Greenhouse effect Human activities-emission Burning natural gas, coal, and oil Electricity generation Deforestation Many factories produce long-lasting industrial gases Population growth 3.What’re the effects of global warming Effects on Humans Effects on Wildlife Global warming is a danger to a humans health. Its affect on climate can adversely affect humans. Plagues have been attributed to global warming. An increase in temperature can result in a longer life cycle for diseases. Global warming can affect our future ability to obtain food. As climates change, plants and animals will change, leading to a change in the eating patterns of humans. Effects on Humans Effects on Wildlife Polar Bears Require pack ice to live Might eventually go extinct in the wild Sea turtles Breed on the same islands astheir birth Could go extinct on some islandsas beaches are flooded Other species may go extinct as rainfall patterns cha