Today Walmart ranks as one of the biggest and fastest growing climate polluters in the country. If it were included in the Greenhouse 100 Polluters Index, a list that is limited to heavy industrial firms, such as oil companies and power plants, Walmart would take the 33rd spot, just a hair behind Chevron, America’s second largestSpecifically, Walmart's reported greenhouse gas emissions have risen 14 percent since 2005 even though the corporation doesn't include emissions from its international shipping in its accounting. The environmental impact of always building new, car-centered stores also doesn't factor into Walmart's sustainability self-reporting. But even compared with other big box stores, Walmart's emissions are high.
Walmart's claims about using renewable energy are also immensely exaggerated. Walmart is massive enough that using even a small share of renewable energy is enough to put it on the Environmental Protection Agency's list of top retail users of green power—and using a small share is exactly what Walmart has done: