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water shortage
city problems
pollution
Bad effects
Water Shortage
约占世界人口总数40%的80个国家和地区严重缺水。目前，全球80多个国家的约15亿人口面临淡水不足，其中26个国家的3亿人口完全生活在缺水状态。预计到2025年，全世界将有30亿人口缺水，涉及的国家和地区达40多个。
These are not true snows.
These are plastic bags.
白色污染(White Pollution)是人们对难降解的塑料垃圾（多指塑料袋）污染环境现象的一种形象称谓。它是指用聚苯乙烯、聚丙烯、聚氯乙烯等高分子化合物制成的各类生活塑料制品使用后被弃置成为固体废物，由于随意乱丢乱扔，难于降解处理，以致环境严重污染的现象。
Sometimes colorful things are a kind of burden!
Tomorrow’s mountain
Overpopulation makes the traffic crowded. It makes the environment terrible. So we must try our best to control the population.
Where do you prefer to live, in a quiet country village or a big city? Why?
Work in pairs and answer the questions.
Using the words in the box to help you.
countryside field flat hospital
job office rubbish village
Because they want to look for jobs and have a better life.
1. Why do people move to cities?
2. What are the problems of big cities?
Pollution, crime, loneliness, rubbish collection and so on are the problems of cities.
Listen to the passage and check the true sentences.
1. Parkville was a quite village.
2. Arnwick was a city with 20,000 people.
3. Parkville now has a population of more than one million.
4. The local school in Parkville has 2,000 pupils.
5. Big cities need more money for public services.
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