Reuters: U.N. Secretary-General Ban Ki-moon is organizing a summit meeting on climate change next month where he hopes President Barack Obama will confirm a “sea change” in U.S. environment policy, diplomats said. Several national diplomats and U.N. officials said they were aware of Ban’s plan to invite Obama and the leaders of up to several dozen other countries to New York in late March for what they described as a “mini summit” on climate change ahead of high-level talks on the global …