Indo-Asian News Service: US President Barack Obama has invited the leaders of 16 major economies including India to Washington for a forum on energy and climate next month to prepare ground for a new global climate change regime. The forum, scheduled for April 27-28, seeks to “generate the political leadership necessary” for a successful outcome at the UN climate change negotiation to be held in Copenhagen in December, the White House said in a statement Saturday. Obama, who recently turned his …