Also, resource collapse. Yemen is in the process of running out of water; either some large expensive solution needs to be deployed in a very poor country, or a million or more people need to move or die.
I don't see anything in these articles that proves that climate change is either the primary proximate cause or a necessary cause for the migration from the Middle East to Europe. It is still more simply explained by political expediency than it is by climate change.
https://thinkprogress.org/yemen-humanitarian-crisis-water-54...