Walmart is committed to sustainability through various initiatives to reduce its environmental impact and help customers live better. It aims to power all operations with renewable energy by 2050 and eliminate 20 million metric tons of greenhouse gas emissions from its supply chain by 2015. Walmart works with over 100,000 suppliers through Sustainable Value Networks to integrate sustainable practices across its business, including programs to increase energy efficiency, reduce waste, and develop more sustainable products. It also hosts sustainability summits to encourage suppliers to be socially and environmentally responsible.