Wal-Mart said it was on track for its U.S. stores to stop sending any waste to landfills by 2025. By the end of 2011, it sent roughly 20 percent of its waste to landfills. Two years ago, it sent 36 percent of its waste to landfills. The company said 22 percent of the electricity it used in its global operations during all of 2010 came from renewable sources, while 15 percent of all the energy it used came from renewables. The company is still calculating its renewable use for 2011.