Environmental_Protection(环境保护演讲PPT).ppt

Rising sea levels What can we do? Thanks for your listening! Team from landscape architecture class X Team Members： Environmental Protection Our topic What do you know about greenhouse effect? Global warming? Rising sea levels? The impact on the earth? Outline Greenhouse effect Global warming Rising sea levels Greenhouse effect What is the greenhouse effect ? On a sunny winter day, you park your car in the sun, lock it, and go cruise the local shopping mall for a couple of hours. When you come back later and get into your car, what do you notice? Is the interior of the car hot or cold? How does the temperature inside of your car compare to the temperature outside? If you have ever been inside of a greenhouse, especially when the sun is out, what have you observed? It is definitely warm, and usually the air is moist. A greenhouse is commonly warmer than the outside air because a greenhouse has the ability to trap heat inside of it. This phenomenon is called the greenhouse effect. Greenhouse effect The heat caused by infrared radiation is absorbed by greenhouse gases such as water vapor, carbon dioxide, ozone and methane, which slows its escape from the atmosphere. Although greenhouse gases make up only about 1 percent of the Earths atmosphere, they regulate our climate by trapping heat and holding it in a kind of warm-air blanket that surrounds the planet. Life on the earth depends on energy from the sun. About 30 percent of the sunlight that beams toward Earth is deflected by the outer atmosphere and scattered back into space. The rest reaches the planets surface and is reflected upward again as a type of slow-moving energy called infrared radiation. Greenhouse effect The greenhouse effect is a naturally occurring process that aids in heating the Earths surface and atmosphere. It results from the fact that certain atmospheric gases, such as carbon dioxide, water vapor, and methane, are able to change the energy balance of the planet by ab