2. Mexico City is sinking. The city is located on a soft clay soil that is constantly compressing. This is causing the city to sink at a rate of about 10 centimeters per year. This sinking is causing damage to buildings and infrastructure, and it is also increasing the risk of flooding.
3. Mexico City is overcrowded. The city has a population of more than 20 million people, making it one of the most densely populated cities in the world. This overcrowding is putting a strain on the city's resources, such as housing, water, and transportation.
4. Mexico City is located in an earthquake zone. The city is located on a major earthquake fault line, which means that it is at high risk of earthquakes. The most recent major earthquake to hit Mexico City was in 1985, and it caused widespread damage and loss of life.