As long as geographic boundaries are broken by our species through our technological advancements, this will occur.
The thing is...like "sex" is used to diversify our genomes, so is time and the ever changing landscapes we live on Earth.
We never know when something will hinder our civilization to move forward, especially another global shift in climate.
Although we do live on every continent and climate(except Antarctica), we are not as resilient as Tardigrades, which are said to be able to survive any global catastrophe.