Walmart goes local, supports small farmers

You know the "go local" movement has hit the mainstream when the world's largest retailer and biggest seller of grocery items in this country, announces a "global commitment to sustainable agriculture." One the company says will help small and medium-sized farmers expand and grow, reduce the environmental impact of farming, and strengthen local economies.

Those are some lofty goals, but when a company is the size of Walmart -- with annual sales of more than $400 billion -- even the smallest environmental effort can have a significant effect.