According to a survey conducted in April by PSB's Internet Surveys Group, and released at the Sustainable Brands '07 conference this week, consumer spending on green products may total $500 billion annually, or $43 billion per month.

The survey group believes the products that consumers sill spend more on include those that are easiest to implement, such as environmentally-friendly lighting and energy-saving appliances.

Despite bipartisan differences on politics and religion, 90 percent of Americans agree that there are important green issues and problems, and 82 percent believe it is important for companies to implement environmentally-friendly practices.

So it seems like a good time for Wal-Mart to decide to sell only eco-friendly laundry detergents. The store sells a quarter of the liquid laundry detergent in the United States. Hopefully the results of this survey will convince other retailers to make huge changes as well.