UN chief Ban Ki-moon suggests that trace amounts of CO2 will cause countries to become "potential breeding grounds for extremism and international criminal activity"

UN Secretary-General Ban Ki-moon's remarks at TICAD V event

Predictions are dire. Severe water stress could affect as many as 250 million Africans – not in some distant future, but by the end of this decade. Failed rains are likely to cause extensive crop damage. That means less food for more people.

Development setbacks can breed unrest. Countries destabilized by climate change are potential breeding grounds for extremism and international criminal activity. They are a source of mass migration.