On KTRS/St. Louis today, I talked with my friend Joel Makower about his new book, “Strategies for the Green Economy,” in which he lays out opportunities for businesses to embrace the environment while adding to their bottom line.

We discussed whether we can afford to worry about being green during a recession, how companies like Wal-Mart can have a measurable positive impact on the environment because of their size, and where we stand on alternatives to oil- and gas-powered vehicles. I also asked Joel for his assessment of Obama’s choices for his administration’s energy and environmental team, and whether government should force people and businesses to be greener.

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As Chairman and Executive Editor of Greener World Media, Joel publishes GreenBiz.com, GreeenerBuildings.com, ClimateBiz.com, and other sites. He also blogs here.