The collapse of the ancient Maya agricultural system — deforestation, soil erosion, and the consequent disruption of water cycles — was a major contributing factor to the Classic Maya collapse. Environmental history and political history are inseparable.

Ancient DNA is transforming population genetics and migration history faster than the historical field can absorb the implications. The steppe ancestry component in European populations, invisible to ancient historians, is now documented in thousands of skeletal samples.

This is the post that finally got me to watch the film I've been avoiding because of its runtime.