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While many Mayanists agree that wars contributed to the collapse, no one thinks they were the whole story. Another factor was overexploitation of the rain-forest ecosystem, on which the Maya depended for food. University of Arizona archaeologist T. Patrick Culbert says pollen recovered from underground debris shows clearly that "there was almost no tropical forest left."
Water shortages might have played a role in the collapse as well: University of Cincinnati archaeologist Vernon Scarborough has found evidence of sophisticated reservoir systems in Tikal and other landlocked Maya cities (some of the settlements newly discovered this week also have reservoirs). Since those cities depended on stored rainfall during the four dry months of the year, they would have been extremely vulnerable to a prolonged drought.
Overpopulation was another problem. On the basis of data collected from about 20 sites, Culbert estimates that there were as many as 200 people per sq km in the southern lowlands of Central America. Says Culbert: "This is an astonishingly high figure; it ranks up there with the most heavily populated parts of the pre-industrial world. And the north may have been even more densely populated."
One inevitable consequence of overpopulation and a disintegrating agricultural system would be malnutrition -- and in fact, some researchers are beginning to find preliminary evidence of undernourishment in children's skeletons from the late Classic period. Given all the stresses on Maya society, says Culbert, what ultimately sent it over the edge "could have been < something totally trivial -- two bad hurricane seasons, say, or a crazy king. An enormously strained system like this could have been pushed over in a million ways."
What sorts of lessons can be drawn from the Maya collapse? Most experts point to the environmental messages. "The Maya were overpopulated and they overexploited their environment and millions of them died," says Culbert bluntly. "That knowledge isn't going to solve the modern world situation, but it's silly to ignore it and say it has nothing to do with us." National Geographic archaeologist George Stuart agrees. The most important message, he says, is "not to cut down the rain forest." But others are not so sure. Says Stephen Houston, a hieroglyphics expert from Vanderbilt University: "I think we should be careful of finding too many lessons in the Maya. They were a different society, and the glue that held them together was different."
Just how different the Maya were is clear from their everyday lives, on which archaeologists are increasingly focusing. From the contents of graves and burial caches, the architecture of ordinary houses, and scenes painted on pottery, Demarest and others are learning what an average Maya day was like.
The typical Maya family (averaging five to seven members, archaeologists guess) probably arose before dawn to a breakfast of hot chocolate -- or, if they weren't rich enough, a thick, hot corn drink called atole -- and tortillas or tamales. The house was usually a one-room hut built of interwoven poles covered with dried mud. Meals of corn, squash and beans, supplemented with the occasional turkey or rabbit, were probably eaten on the run.