NEW YORK -- Wal-Mart is stepping up the greening of its stores, Marketing Daily reports. The retailer has been changing its way of doing business to include more environmentally friendly practices.

Wal-Mart president and CEO Lee Scott revealed at the Clinton Global Initiative last week that the company will only sell concentrated liquid laundry detergent products in its U.S. Wal-Mart stores and Sam's Clubs. Scott told attendees that the detergents will save more than 400 million gallons of water, 95 million pounds of plastic and 125 million pounds of cardboard.

Scott said the retailer wants "to be a catalyst for the transformation of the entire liquid laundry detergent category across the retail industry and save vast amounts of natural resources."

Other recent environmentally friendly projects include a partnership with the Carbon Disclosure Project to uncover how much energy is used to create products along its supply chain, such as the procurement, manufacturing and distribution processes, and the introduction of a line of compact fluorescent light bulbs. "Using this measurement tool, Wal-Mart will initiate a pilot with a group of suppliers to look for new and innovative ways to make the entire process more energy efficient," the company said in a statement.

The concentrated detergent rollout starts in Southern stores today, with all stores carrying the products by May 2008. "The rollout will include such brands as Tide, All small-and-mighty, Wisk, Purex, Sun, Great Value, Arm & Hammer and Xtra," the company said.

Wal-Mart plans to market the new detergents with interactive point-of-purchase displays to help customers understand the environmental benefits.