Journalist and historian in war studies Gwynne Dyer explores the cultural and political ramifications of climate change and discusses his book, "Climate Wars: The Fight for Survival as the World Overheats." Dwindling resources. Massive population shifts. Natural disasters. Spreading epidemics. Drought. Rising sea levels. Plummeting agricultural yields. Crashing economies. Political extremism. These are just some of the expected consequences of runaway climate change in the decades ahead--and any of them could tip the world towards conflict.