In 2005, Wal-Mart launched its "sustainability program," a marketing campaign aimed at positioning the company as a leader on corporate environmental responsibility.  Meanwhile, Wal-Mart has continued to provide support the U.S. Chamber of Commerce, a leader in the fight to roll-back the regulation of greenhouse gas emissions and cut funding for the Environmental Protection Agency.  Companies such as Apple, Exelon and PG&E withdrew their memberships from the Chamber because of disagreements over these issues.  

Sources:

[1]  http://documents.foodandwaterwatch.org/doc/walmartsustainability.pdf 
[2]  http://chamber.350.org/poster/ 
[3] http://blog.chron.com/newswatchenergy/2010/06/business-lobby-asks-feds-to-lift-deep-water-drilling-ban/
[4] http://thehill.com/blogs/e2-wire/e2-wire/114281-us-chamber-lawsuit-attacks-basis-for-epa-climate-rules
[5] http://www.politicalaccountability.net/index.php?ht=a/GetDocumentAction/i/5292

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