Reuters: Failure to act quickly on climate change could eventually lead to violence and mass unrest as global weather patterns drastically change, U.N. Secretary-General Ban Ki-moon said on Tuesday. “If we fail to act, climate change will intensify droughts, floods and other natural disasters,” Ban said at a forum near Seoul that came weeks ahead of his own conference on climate change in September. “Water shortages will affect hundreds of millions of people. Malnutrition will engulf …