https://www.earthobservatory.nasa.gov/images/77060/mayan-def...
From newish imaging. We can see the impressions of vast jungle swaths cut down and way made for planting food and houses. This looks to have disrupted the water cycle enough to cause cinotes (underground water systems and only source of drinking water) to deplete. We see sacrificial remnants below the modern water line. Their water disappeared and so did their civilization. By the time the Spanish arrived, the local people had no knowledge of how to build nor maintain their now ancient cities, the jungles regrew, water came back, and sacrificial artifacts were covered by replenished water levels.
They are an example of man made effects on local weather leading to the downfall of an advanced civilization.