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雅思口语备考资料分享：economic development

2018-03-27 10:42:30来源：网络 柯林斯词典

　　- 2 serious pollution problems are:

　　- Acid rain: this happens when gases and chemicals mix with water in the air. The mixture travels for hundreds of miles and finally falls back to earth. Because “Acid rain” contains a lot of chemicals - It kills fish and trees.

　　- The Greenhouse effect: gases and chemicals are the reason for this problems, too. Some of them stay in the air like a blnket around the world. Because of this blanket, the Earth’s climate is changing and getting hotter.

　　- Desserts: soil erosion:

　　- More people -> fewer trees -> greater use of land -> thinner soil -> erosion -> famine.

　　- Water: in the developing world, clean water is rare -> dig deep wells.

　　- Rain Forest: in the last 40 years, half of the world’s forests have dissappeared. If this continues for the next 40 years, millions of specis of plants and animals will become extinct. And that’s just the beginning.

　　- Why is the crisis happening?

　　- Because developing world farmers don’t have enough land for places growing food and places living.

　　- Rich countries depend on rain forest products.

　　- Modern life in the developed world depends on rain forest products. These includes:

　　- Mineral

　　- Wood

　　- Medicine

　　- rubber

　　- effects of the crisis:

　　- the world’s rainforests are facing a Idontknowl disaster. Some scientists says it’s even worse than the effect of nuclear war.

　　- The rainforest fires in Africa are so big that they appear in sattellite photos. But it’s not just a question of diappearing of tribes, trees and species.

　　- It’s a question of climat, too. Out planet needs healthy rainforests to contrl its temperature. Without them, the greenhouse Effect will just get worse and worse.

　　- Used most of the Earth’s oil, gas and coal.

　　- Completely killed more than 500 kinds of animals, birds and plants.

　　- 2030: 25% of animals, birds, fish and insects may be extinct.

　　- Reasons:

　　- Pollution: millions of animals die every year because man has polluted their natural home or habitat.

　　- Hunting: man hunts and kills millions of animals every year.

　　- Environment itself:

　　- smaller: man cuts down more trees, build more road, uses more land for farming ->fewer jungles, fields and forest for wild life.

　　- Made and used atomic bombs.

　　- Grown in numbers from 1 billion ( 1830) to more than 6 billions today.

　　- natural resources: water source, biological source, energy resources are harmed by human’s exploration:

　　- strip mining devastate whole regions, leaving bare and useless ground.

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