Fifty years ago, University of California professor Garrett Hardin penned an influential essay in the journal Science. Hardin saw all humans as selfish herders: we worry that our neighbors’ cattle will graze the best grass. So, we send more of our cows out to consume that grass first. We take it first, before someone else steals our share. This creates a vicious cycle of environmental degradation that Hardin described as the “tragedy of the commons.”