OK, I know that title sounds kinda silly. Yogurt is produced from milk produced from cows that spew a whole lot of carbon into our atmosphere. But Stonyfield Organic Yogurt, based right near me in Londonderry, NH, has started a rewards program where you can save up points from their containers and redeem them for things like more yogurt, snacks and even carbon offsets.
For every kilowatt hour of electricity a renewable generator generates, it also generates a one-kilowatt hour renewable energy credit. The generator can sell both commodities together as "renewable electricity" or sell the electricity as "generic" electricity to one buyer and the RECs to other buyers. Legally, it's all about who owns the RECs