At its recent Global Sustainability Milestone Meeting, Walmart president and CEO Mike Duke highlighted the company's Sustainability Index, a measurement system used to track the environmental impact of products.

"We've reached an acceleration point where we are moving from measurement to results. We're starting to really drive progress with the Index," Duke said.

"Using less energy, greener chemicals, fewer fertilizers and more recycled materials - all of this - is the right thing to do for the planet and it's right for our customers and our business," he said.

The Sustainability Index has been applied to 200 product categories, and to more than 1,000 suppliers. By the end of this year, Duke says the Index will expand to include more than 300 product categories and as many as 5,000 suppliers.

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