Besides advantages, living in the city brings to us a lot of disadvantages. Firstly, a problem about which everyone is worrying is environment. The increase of factories based on industrialization and modernization has severely polluted environment. Smoke from factories' chimneys not only pollutes the air but also makes people get many serious cancers. Sewage is bumped into rivers without being purged, which threatens underwater ecosystems. The second drawback of living in the city is society's vices such as drug addiction. Young people. especially the students, are easily spoiled by bad habits. If people use up all the money, they can't control themselves and even become robbers or murders. Moreover, a problem that many people living in the city have is heartlessness. With some people, it's not worth being worried and it has no effect on our life, people are too busy to care for any others. But if more and more people become heartless, the society will be worse, no one cares another one, they live boring lives, every purposes became meaningless, without love, sympathy and many other good things.