What happens when humans continue to pursue a capitalist economic system, that destroys vital oxygen-producing organisms from phytoplankton, to trees in fragile rainforest ecosystems? That is an easy one, yeh. The result would be a decreasing supply of oxygen in Earth's atmosphere, in relationship to other toxic gases. The greed-driven Petroleum-based economies of the Western World has put humanity and other life much closer to the brink, than what "mainstream" environmental groups would care to admit.