By Dan Shapley
It used to be the best you could expect from a credit card was 1 percent back on your purchases, and the guilt-free feeling of delaying the sting of big-ticket buys. Now, you can pump a little money into your favorite cause, or green product, with an array of new green-themed rewards programs. Banks have not only got climate religion at the top, as more and more Wall Street bigs pledge to invest in renewable energy and efficiency, but they're passing along that option to their customers. Credit cards are all about making it easier to spend hard-earned cash, but when the weekend splurge comes with investment in wind energy or a solar-powered battery charger, it feels a little bit better, according to a story in the May 18 USA Today.