Retail companies using energy-efficient practices, such as monitoring building temperatures, can reduce costs. (Bright_Star/FLICKR)

BY HANNAH KOKJOHN – MEDILL NEWS SERVICE

Just as the U.S. Census Bureau released its unexpectedly dismal March report of a 1.1 percent drop in U.S. food and retail service sales, Prenova Inc., an Atlanta-based energy management company, twisted the [...]