Greenhouse Gas Emissions

Reducing carbon emissions in our stores and global supply chain


Walmart is known for being efficient with resources – and that holds true when it comes to reducing greenhouse gas (GHG) emissions. For seven consecutive years, we’ve reduced our Scope 1 and 2 carbon intensity. And we are on track to hold our absolute emissions flat over this decade, despite our continued growth.

  • Scope 1 emissions:  On-site fuel combustion, mobile fuel combustion from leased and owned vehicles, livestock waste emissions from poultry farms and refrigerants
  • Scope 2 emissions:  Purchased electricity and purchased hot or cold water
  • Scope 3 emissions:  Corporate business air travel, operational waste and leased facilities

Greenhouse Gas Emissions


These achievements in climate stewardship are a testament to the actions our associates take to operate more efficiently – and more sustainably – worldwide. From our relentless pursuit of renewable power and commitment to fleet and building efficiency, to our ability to divert operational waste from landfills, Walmart is proof that businesses can prosper while reducing emissions.

GHG emission contributions by source

  • 73% purchased energy
  • 12% refrigerants
  • 7% transport fuel
  • 7% on-site fuel
  • 1% other

Supply chain GHG

We understand the GHG associated with our global supply chain is many times larger than our direct emissions. So in February 2010, we committed to eliminate 20 million metric tons (MMT) of greenhouse gas emissions from our global supply chain by the end of 2015.

We knew this goal was an aggressive one, and we’ve encountered a variety of challenges along the way. When there is no predefined roadmap to success, we must rely on experimentation, trial and error, and rapid prototyping before we can scale real innovation. We have done so and are now beginning to see the results.

To date, we have eliminated more than 7.575 MMT of GHG emissions from our supply chain and are on track to push that number to 18 MMT by 2015. By managing a portfolio of projects and leveraging the Sustainability Index to spur innovation and create accountability, we are now on track to achieve our goal.