They had climate change, and it was one of the main reasons "barbarians" migrated, and Rome had fallen. https://en.wikipedia.org/wiki/Climate_of_Ancient_Rome#E

They had climate change, and it was one of the main reasons "barbarians" migrated, and Rome had fallen. https://en.wikipedia.org/wiki/Climate_of_Ancient_Rome#Environmental_issues_and_climate_change https://en.wikipedia.org/wiki/Climate_of_Ancient_Rome#Enviro...