Our entire "green" economic transition is based on carbon credits and global warming. Unfortunately that is ALL people seem to care about. While global warming is a crisis and is extremely important, it is only one aspect of the environmental dilemma that we find ourselves in. The challenge with basing everything off of any single individual matrix is that it cannot fully capture many important factors that contribute to the overall environmental crisis. For example, how does the carbon matrix deal with the pollution caused by toxic chemicals? The carbon footprint of dumping chemicals in a river may in fact be less than if you trucked them to a location where they could be safely disposed.