More than 900 people are confirmed to attend Wal-Mart Stores' Brazil Sustainability Summit, which starts today (June 25) in Sao Paolo.

Wal-Mart's Brazil division will announce commitments on deforestation, supply chain and packaging initiatives.

Wal-Mart's existing stores are to be 20 per cent more energy efficient in seven years, reports just-food.

New stores are to be 30 per cent more efficient within four years and the truck fleet 25 per cent more efficient in three years, according to Wal-Mart standards.

The retailer will send information about the conference through social media site twitter.com.