OMAHA, Neb.--(BUSINESS WIRE)--ConAgra Foods, Inc., (NYSE: CAG) announced the winners of its 2015 Sustainable Development Awards yesterday, an internal awards program that drives and rewards imaginative approaches to sustainability and produces bottom line business results. The 82 entries received this year collectively: Eliminated waste by 58,700 tons Optimized and improved packaging, while using 15 million pounds less material Conserved more than 97 million gallons of water And reduced greenho