The city's nearing its saturation point. It's in shambles. The consumption, per capita, of water in Mexico City has been increasing. We use double what is consumed in Europe. Well, there is a very linear relationship, and an inverse relation, between population growth and the environment.
People grab what they can when there are too many people and too little resources.
So the environment suffers when the population grows. I'm convinced that the biggest environmental problem for the world is population explosion. You cannot have a sound management of resources with an ever-growing population that also grows and needs energy, and so on. If we are going to have a sustainable world, we will have to have a stable world population, even decreasing a little bit. If every family has only two children, then we will reach a number that is manageable for the planet.