U.S. Senator Kerry reacts during a news conference at the UN Climate Change Conference COP15 at the Bella Center in Copenhagen

U.S. Senator Kerry reacts during a news conference at the UN Climate Change Conference COP15 at the Bella Center in Copenhagen

U.S. Senator John Kerry reacts during a news conference at the UN Climate Change Conference COP15 at the Bella Center in Copenhagen December 16, 2009. Kerry raised the possibility on Wednesday that a major energy and climate change bill he is trying to craft might not contain the “cap and trade” mechanism for reducing carbon dioxide emissions. REUTERS/Scanpix/Henning Bagger