环境保护(英文版).ppt

环境保护(英文版)14618Environmental Protection
Environment
is the things around the center of things
The law of
Environmental Protection
Environment is :
air, water, land, minerals, forests wildlife (野生动植物)
aquatic flora , historical sites, scenic areas , nature reserves,
What is happening
on the earth every second
● Neonates born in the world.
● extracted tons of metal.
● produce cars.
● CO2 emissions of 760 tons worldwide.
● Decrease of square kilometers forest.
The world's
top ten environmental problems
◆ warming---全球变暖
◆ layer depletion---臭氧层破坏
◆ of biodiversity---生物多样性减少
◆ spread of acid rain---酸雨蔓延
◆ dropped---森林锐减
◆ ---土地荒漠化
◆ pollution---大气污染
◆ pollution---水体污染
◆ pollution---海洋污染
Global warming
◆Gradually increasing the greenhouse effect, Earth's temperature rising.
◆ Main hazards(危害):
abnormal weather, species extinction, the sea level rising.
◆ Ozone (O3) layer: the Earth's 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).
Ozone layer depletion
Loss of biodiversity
The spread of acid rain
◆ Global extinction of 50,000 species / year,
140 / day on average.
◆ pH < 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.
Forest dropped
Desertification
◆ Huge numbers of global deforestation.
◆ 600 million square kilometers of land into desert each year.
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.
Water pollution
◆ About 40% of the world’s rivers are seriously polluted.
◆ Freshwater(淡水)resources are ing exhausted.
Marine pollution
Cross-boundary movements of poi