Agence France-Presse: President Barack Obama Saturday launched a Major Economies Forum on Energy and Climate to give a boost to a historic agreement on climate change facilitated by the UN. Leaders from the 16 major economies are to participate in a “preparatory session” on April 27-28 in Washington to “help generate the political leadership” for successful climate change negotiations December in Copenhagen, the White House said in a statement. The forum, the White House added, would encourage “a …