A couple of years ago I attended a speech at UWO by Gwynne Dyer. As expected it was an interesting talk. One of things he mentioned was (paraphrasing) that he began to take climate change seriously when he realized that various military establishments were starting to plan for the its effects. Most notably mass population migration and starvation. Specifically, the British military was planning how it was going to stop people from migrating to the island when more southerly lands became unable to feed their populations. Interesting stuff.
Today while wondering around Chapters I discovered Climate Wars by Gwynne Dyer. This is going to be an interesting read.