环境工程英语Unit6--.ppt

Unit 6 Effects on Climate and Ecological Environment After Unit 6, th students should understand: -the sources and types of greenhouse gases -the concept of greenhouse gas effect -effects of greenhouse effect on climate change -the international efforts in controlling greenhouse effect I Greenhouse effect 1 -is a natural warming process of the earth. When the suns energy reaches the earth some of it is reflected back to space and the rest is absorbed. The absorbed energy warms the earths surface which then emits heat energy back toward space as longwave radiation. This outgoing longwave radiation is partially trapped by greenhouse gases such as carbon dioxide, methane and water vapour which then radiate the energy in all directions, warming the earths surface and atmosphere. 2 Consequences of the greenhouse effect Sea levels rise, possibly as much as two feet, by the end of next century. Rising temperatures could lead to changes in regional wind systems which would influence global rainfall distribution and lead to the redistribution and frequency of floods, droughts and forest fires. Windstorms and hurricanes could become more frequent and more intense. Increased sea temperatures would cause coral bleaching and the destruction of coral reefs around the world. Climate change would create favorable conditions for growth in insect populations. This would likely have a negative effect on agriculture and human health, and result in a spread of malaria and other tropical diseases. Water supplies would become disrupted in some regions, particularly in already vulnerable, arid areas. II New Words and Expressions CO2 induced, CO2引起的 climatic model气候模型 ,natural fluctuation in climate气候的自然波动 , -to be well recognized 得到很好认可 -to be characterized as 表示…. 特性 ,刻画 … 性格 -to be characterized by 具有 …. 特征 -in the short term/long term 短期/长期 -take into account 考虑 -contribute to 贡献 -with something in mind 记住 III Kyoto Protocol -1992, the World Summit on Environmen