Associated Press: U.S. Energy Secretary Steven Chu is warning that if countries don’t do something about climate change, “some island states will simply disappear.” The energy secretary is traveling with President Barack Obama to the two-island nation of Trinidad and Tobago for a summit of the Western Hemisphere’s democracies. Chu told reporters at the Summit of the Americas on Saturday that Obama pushed leaders to work to stem rising temperatures. Chu said that rising temperatures lead to more …