San Jose Mercury News: Energy Secretary Steven Chu, renowned policy wonk, has found vivid language to highlight the threat of global warming: “Earth is like the great ship Titanic,” on a collision course with disaster unless action is taken. “Off in the distance is an iceberg, so how do you turn the ship so there is only a glancing blow?” he said Tuesday at a Newsweek-sponsored energy conference in Washington. “And the good ship Earth takes time to turn.” Chu, a Nobel Prize-winning physicist and …