环境保护PPT(英文版).pptVIP

Environmental Protection Environment is the things around the center of things The law of Environmental Protection Environment is : air, water, land, minerals, forests grasslands, wildlife (野生动植物) aquatic flora and fauna(水生动植物) historical sites, scenic areas nature reserves, residential areas What is happening on the earth every second ● 2.4 Neonates born in the world. ● extracted 28.6 tons of metal. ● produce 1.3 cars. ● CO2 emissions of 760 tons worldwide. ● Decrease of 0.6 square kilometers forest. The worlds top ten environmental problems ◆ 1.Global warming---全球变暖 ◆ 2.Ozone layer depletion---臭氧层破坏 ◆ 3.Loss of biodiversity---生物多样性减少 ◆ 4.The spread of acid rain---酸雨蔓延 ◆ 5.Forest dropped---森林锐减 ◆ 6.Desertification---土地荒漠化 ◆ 7.Air pollution---大气污染 ◆ 8.Water pollution---水体污染 ◆ 9.Marine pollution---海洋污染 ◆ 10.Cross-boundary movements of poisonous wastes---毒性废弃物越境转移 NO.1 Global warming ◆Gradually increasing the greenhouse effect, Earths temperature rising. ◆ Main hazards(危害): abnormal weather, species extinction, the sea level rising. ◆ Ozone (O3) layer: the Earths protective layer ◆ Main hazards: strong UV (ultra-violet ray紫外线) radiation can damage immune system（免疫系统） of human natures and animals , cause skin cancer and cataracts（白内障）, damage to the earth’s ecosystems（全球生态系统）. NO.2 Ozone layer depletion NO.3 Loss of biodiversity NO.4 The spread of acid rain ◆ Global extinction of 50,000 species / year, 140 / day on average. ◆ pH 5.6 referred as acid rain. ◆ Main hazards: Water and soil acidification(酸化), plant and animal death, corrosion(腐蚀) buildings, railways and bridges and other facilities. NO.5 Forest dropped NO.6 Desertification ◆ Huge numbers of global deforestation. ◆ 600 million square kilometers of land into desert each year. NO.7 Air pollution ◆ Sulfide and nitrogen oxides(硫化物和氮氧化合物) into the atmosphere worldwide up to 30 million tons each year. NO.8 Water pollution ◆ About 40% of the world’s rivers are seriously polluted. ◆ Freshw