Sustainabilty

When did "sustainability" become synonymous for social responsibility? I mean the word just doesn't conjure up visions of being "green." In fact, when did a color become synonymous for "sustainability?" Wasn't that Kermit's domain anyway? Who'd have thought that he would become reference in our blog? Just a few short years ago, I would have thought that "sustainability" referred to those girly-men out there who weren't able to prolong their manhood, kind of like Nathan who buy's Viagra in Club Packs at Costco.