The movement of a tiny group of people relative to the size of the EU drastically shifted the entire political structure of the EU, leading to Brexit and several other countries considering the same. Magnify that affect by the number of people that will be moving due to climate change, and you get an extinction event.
Syrian refugees were the end result of climate shift in Syria.
I don’t see how this answers my question.
The movement of a tiny group of people relative to the size of the EU drastically shifted the entire political structure of the EU, leading to Brexit and several other countries considering the same. Magnify that affect by the number of people that will be moving due to climate change, and you get an extinction event.