Agence France-Presse: The European Union is committed to playing a key role at the UN’s global warming summit later this month in Copenhagen, the bloc’s new president Herman Van Rompuy said Tuesday. “On climate change, the (European) Union is determined to continue playing a key role, a constructive role which could lead to an ambitious global agreement,” Van Rompuy said in French during a joint press conference with Italian Prime Minister Silvio Berlusconi. “But our action in the EU will not be …