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Global Warming 1.What is global warming Global warming is the gradual rise in the Earth's 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 3.What’re the effects of global warming Effects on Humans Effects on Wildlife Effects on Humans Global warming is a danger to a human's 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 Wildlife Polar Bears Require pack ice to live Might eventually go extinct in the wild Sea turtles Breed on the same islands as their birth Could go extinct on some islands as beaches are flooded Other species may go extinct as rainfall patterns change throughout the world So we must take effective measures to solve this problem What should we do? 4.What should do 1.Individual efforts 2.National efforts First， we should use more clean energy and less coal and oil. Second， we should go to work on foot or by bus instead of driving a car if possible. Third， we should plant more trees， because plants can turn CO2 into oxygen. More importantly， we should form the habit of saving energy in our daily life. What should governments do? First， governments can support research. For example， they should encourage companies to develop vehicles that cause less pollution. They should also support alternative sources of electricity from wind and water rather than from oil and coal. Secondly， they should make laws that limit the amount of greenhouse gases that companies can emit. Private companies should be rewarded for following these laws. They should also be punished for creating pollution. The earth is our home，we have the responsibility to protect it .We must take measures to prevent global warming as eraly as possible.
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