Right now they are doing something pretty darn cool. If you donate $15 to Greenpeace, you get $15 in Groupon bucks. I have to say, I think this is a pretty unique way for a company to team up with a charity and I rather like the concept. Essentially, it’s a free donation in your name. The only downside I can see is Greenpeace doesn’t offer tax deductible donations. Also, the $15 cashback in Groupon credit is only being offered to the first 6,667 people who donate. Currently 5015 people have taken part in this offer, so there’s still time to get in on it.