While yes, the earth has changed before, the reason it is changing now is because of greenhouse gases being pushed into the atmosphere by human activity. Also climate change take hundreds of thousands of years by slow process, this is the fastest the climate has ever changed. The last 20 years have had the 19 hottest years in recorded history.
The economy in the region of Babylonia was based primarily on grains, oils, and textiles due to it's lack of many vital natural resources in Mesopotamia.
