Walmart today announced a goal to eliminate 20 million metric tons of greenhouse gas (GHG) emissions from its global supply chain by the end of 2015. This represents one and a half times the company's estimated global carbon footprint growth over the next five years and is the equivalent of taking more than 3.8 million cars off the road for a year.

The footprint of Walmart's global supply chain is many times larger than its direct footprint and represents a more impactful opportunity to reduce emissions.

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