It will be hard not to be green:

Walmart is about to supercharge the green revolution. Are you ready because your customers will be asking? Sandra Jones' article

Wal-Mart Stores Inc. is taking steps to give the phrase "green" a measurable definition with an initiative to put eco-labels on the hundreds of thousands of products that end up on its store shelves, sources say.

The idea is to give products a simple, standard rating that allows shoppers at a glance to determine how sustainable a product is, akin to a nutritional label on food.