FORTUNE magazine wrote in a January 26, 2004 feature article titled The Pentagon's Weather Nightmare:
As the planet's carrying capacity shrinks, an ancient pattern reemerges: the eruption of desperate, all-out wars over food, water, and energy supplies. As Harvard archeologist Steven LeBlanc has noted, wars over resources were the norm until about three centuries ago. When such conflicts broke out, 25% of a population's adult males usually died. As abrupt climate change hits home, warfare may again come to define human life.
The same Pentagon report which sparked the FORTUNE article soon prompted another major story in Britain's The Observer which labeled the Pentagon report on Climate Collapse released in 2004 as “Secret”. After describing apocalyptic climate change triggered by global warming and the collapse of the Gulf Stream an important observation was buried in deep in the text.
By 2020 'catastrophic' shortages of water and energy supply will become increasingly harder to overcome, plunging the planet into war.