I saved an ice cap from melting.

I went to Whole Foods for lunch today, not unusual. When they asked me if I wanted a bag I said no, also not unusual. When I was walking back to work I glanced at my receipt and they took off 10 cents from my total on account of "go green bag refund." Obviously 10 cents is not that big of a deal, but I like that aside from preserving man-kind and all other living species there is incentive to be smart about what is necessary to have and what isn't.