Planet Of The Year: Overpopulation Too Many Mouths

THE PROBLEM: Swarms of people are running out of food and space

Close to the Zocalo, Mexico City's great central square, lies the barrio of Morelos, a vast warren of dusty, potholed streets and narrow entryways. The passages lead to a gloomy world. On each side of a roofless patio is a ten- room jumble. Each room holds a family; each family averages five people. The only bathrooms -- two to serve 100 people -- are located at the back of the patio. The odor of grease and sewage permeates the air. Flies buzz relentlessly. The people who live here are considered lucky.

In the shantytowns on Mexico City's outskirts, tens of thousands...

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