We Are Witnessing the First Stages of Civilization’s Collapse
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https://www.thenation.com/article/environment/civilization-collapse-climate-change/
https://www.thenation.com/article/environment/civilization-collapse-climate-change/
Perhaps it's largest as measured in floor space, which is how we usually measure it these days. This seems to be implied by counting "rooms". Unfortunately my education was so poor that I don't even know off-hand whether any ancient mesoamerican pyramids had more floor space than Pueblo Bonito.