Reuters: Nobel Peace Prize winner Al Gore said on Sunday he was optimistic that a growing “people-power” movement would push the world’s leaders to take action to stop global warming. The former US vice president likened the campaign to the ban-the-bomb movement of past decades, and urged leaders at a UN climate conference in Bali, Indonesia, to issue a mandate for a strong treaty to curb greenhouse gases. Gore, who shared the 2007 peace prize with the United Nations’ …