Mother Nature Network: The Terminator has climate change in his sights. Arnold Schwarzenegger, former governor of California and an action-movie star reborn, is traveling around the world taking action against global warming. Will he save the world while also redeeming his tarnished image? "There is a massive weight to be lifted off of our world," Schwarzenegger said in Algeria last month as he announced the latest office of his nonprofit, R20 Regions of Climate Change. "The U.N. can't do it alone. But together, we can."...