The unique ecosystems and their locations around the world are a direct consequence of the oceans and weather. The oceans and weather were wildly different dur

The unique ecosystems and their locations around the world are a direct consequence of the oceans and weather. The oceans and weather were wildly different during the last ice age and consequently the ecosystem present in many places was wildly different than it is today. Even only going back a couple thousand years the changes have been huge (desertification in the ME and North Africa).