As a visual metaphor, let us label the warlike Mesopotamian metaculture as "black", and the ecological metaculture as "white". The "black" metaculture successfully conquered the peaceful "white" cultures due to their lack of militarism. What was needed was an immunological "gray" metaculture. A gray culture appears for all intents and purposes as a "white" culture under normal conditions. However, when a gray culture identifies a "black" culture, it enters immunological mode and annihilates the "black" culture, possibly destroying itself in the process. Had the ancient world been composed of gray cultures instead of "white" ones, then our current world would not be corrupted as it is by greed; we would not be living in a "black" world. Greed directly stems from the notions of separation and ownership. If humanity survives its current "black" metacultural infection and returns to ecologically harmonious ways without first destroying itself and the ecology of the planet by its current path, then humanity will have to adopt the wisdom of gray metaculture, otherwise the cycle of global ecological devastation will begin again when another metacultural infection arises. No sufficiently complex system, be it a peaceful global culture or a biological organism, can survive without an immune system.