Gases from cars are making the air dirty. Dirty water from factories pollutes the rivers. But things may be different in 10 years in Dongtan on Chongming Island, near Shanghai. Dongtan will become the world's first green city in 2030. The city's houses will be around shops, post offices, schools and hospitals. People won't have to travel far every day. Most people will walk or ride bikes to work or to school. There will be more bicycle ways and walk ways than other cities. Buses in the city will use batteries and won't use gases. Buildings will be less than eight floors high and have plants on the tops of buildings. In summer, the plants can help keep homes cool to save electric power. And there will be its own sea wind power station in the city. 80% of the city's trash will be used again. In fact, people in Dongtan will use half the water that people in Shanghai use. Scientists say that Dongtan will be a green city for others to copy. If the city is successful, many other cities in China will follow the example.
