Reuters: The Obama administration will work with the United Nations to reach a climate change deal acceptable to the world community by the end of 2009, U.N. Secretary-General Ban Ki-moon said on Thursday. Speaking to reporters after a two-day trip to Washington earlier this week, Ban said he and the new American leader agreed completely on the urgency of tackling the problem of global warming. “President Obama and I share a fundamental commitment — 2009 must be the year of climate …