Though I hope it not to be the immediate source of war, climate change is a driving force of migration and the competition over scare resources such as fertile land, water and other commodities...
Many scholars daresay that climate change therefore will be a driving force of human conflict in the future...
I think that it is very possible because the new challenges will be resulted in climate change where the nations are facing natural resources limitation
If considering that climate change will modify the patterns of sustainability for many crops and water resources, probably many places increase conflicts for water and food, unfortunately.
When sea level rises suddenly (not impossible) who is going to get the new immigrants? Right now some Europeans are dead against them and Trump is putting up a wall!