Guardian: The Obama administration issued a mea culpa today on America’s role in causing climate change, in a move to get the major economies working together on a global warming treaty. The admission by Hillary Clinton at a two-day meeting of the world’s biggest polluters was intended to ease some of the obstacles towards a deal at UN talks in Copenhagen in December. She placed the gathering of officials from 17 countries, the European Union and the United Nations on a par with the G20 meeting …