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Maya collapse cause found
A study of sediments in Lakes Cobá and Xcanchí on the Yucatán Peninsula found that mercury pollution during the Maya Classic period (250–950 CE) reached high levels—up to 18 micrograms per gram in some samples—exceeding limits set for modern water reservoirs. The mercury buildup, linked to the use of red pigments containing mercury compounds, coincided with declines in algae and cyanobacteria and the disappearance of some crustacean and mollusk species. Researchers believe it may have contributed to environmental degradation and the collapse of Maya civilization, though they do not consider it the sole cause.
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