Mexico city is growing very fast. In 1970 they city had about nine million people. Now it has over 17 million .All these people are causing problems for the city. There are not enough jobs. Also, there is not enough housing. Large families have to lie together in very small homes. Many homes do not have water. They also do not have bathrooms or electricity. The Mexican government is worried about all these problems. It is working hard to make life better in the city.