ScienceDaily: Replacing an old incandescent lightbulb with new LED lighting might seem insignificant in reducing energy consumption. It is a simple step, but an effective one that shouldn't be overlooked, said Yu Wang, an assistant professor of political science, who studies global energy policy and energy efficiency, at Iowa State University. "Many people consider energy efficiency to be the low-hanging fruit," Wang said. "If you're facing the target of trying to mitigate climate change, energy efficiency should...