A group of ex-generals, such as former USMC General Anthony Zinni, have recognized the growing threat of Global Warming on Security. The reason is simple. As the temperature increases, access to resources will become strained. Water supplies sufficient today may become insufficient tomorrow. Even if the net amount of fresh water available on the landmass is unchanged, displacement could cause significant disruption in farming and human habitat location; resulting in competition for desirable locations, and a potential flashpoint for armed conflict.
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