Inter Press Service: U.N. Secretary-General Ban Ki-moon, one of the strongest proponents of next week’s summit on climate change, is confident that world leaders will provide a high political profile for an impending environmental crisis threatening to cause devastation worldwide in the next few decades. “Climate change is the greatest challenge facing this and future generations,” he warns. “If we are to avoid catastrophic consequences for people and the planet, we have less than 10 years to halt …