Reuters: A summit meeting on the financial crisis in London next month will tackle the issue of climate change, which the U.N. chief had planned to make the focus of a separate gathering in New York, diplomats said. Worried that the G20 meeting in London would sidestep concerns about global warming, U.N. Secretary-General Ban Ki-moon had wanted to invite U.S. President Barack Obama and other leaders to New York this month for what U.N. diplomats and officials called a “mini summit” on climate …