Secretary of State John Kerry pauses as he delivers a speech on climate change on Sunday, Feb. 16, 2014, in Jakarta, Indonesia. Climate change may be the world's "most fearsome" weapon of mass destruction and urgent global action is needed to combat it, Kerry said on Sunday, comparing those who deny its existence or question its causes to people who insist the Earth is flat. (AP Photo/ Evan Vucci, Pool) AP Photo/ Evan Vucci, Pool