Brian Linton likes to talk trash. Trash is central to the marketing plan for his Philadelphia apparel company. For every T-shirt, bag, or hoodie sold, the company vows to remove one pound of trash from the world's waterways. Linton's mentor, Jaine Lucas, director of the Temple Innovation and Entrepreneurship Institute, describes him as a social entrepreneur. "Social entrepreneurs are people who run businesses that do good for people or the environment," Lucas said.