Does it seem like the phrases "ecology" and "wedding" could hardly have less in common? With the average wedding costing well over 15 thousand today, one would think so. And yet, the "green" or ecologically-friendly wedding is gaining momentum across the nation. The green wedding, like any other wedding style, has its tribal features. By tribal, I mean the signs and signifiers that help tell the guests what the wedding is supposed to mean, and how the couple prefers to appear. From a tribal pe.