ClimateBiz: Gap Inc. shrunk its carbon footprint by 20 percent over the past five years through lighting retrofits, sourcing renewable energy and an energy management program that targets energy-intensive stores. Its performance helped the San Francisco-based company exceed the goal it set as a member of the U.S. Environmental Protection Agency’s Climate Leaders Program. Gap planned to reduce emissions by 11 percent between 2003 and 2008. The company has focused on its energy use as part …