Agence France Presse: US lawmakers braced Monday for a fight to push a sweeping climate change bill through the Senate, as President George W. Bush threatened to veto it and other opponents railed that it was economically unsound. The legislation, known as the Lieberman-Warner bill after its sponsors, Senators Joe Lieberman and John Warner, calls for a “cap and trade” system, under which companies can trade permits giving them the right to emit a certain amount of pollution, “capped” …