Joe Gallick, vice president of sales with Penske Logistics, reveals some of the dramatic benefits his company has realized, on its own behalf as well as that of customers, by signing up with the ambitious program to slash energy use and greenhouse gas emissions.

Business is going green because of pressure from government and consumers. But the push for sustainability can also aid in controlling costs at a time of economic crisis, says Joe Martha, vice president of Booz-Allen Hamilton.