An angle that appears to be underexplored, is what happens if you let males compete for sustainability. We might be underestimating the effect of classical (or perhaps even biological) provider roles of males, i.e. the amassment of resources to attract a mate. If we could transform this in competition in sustainability, then it might make a huge difference. Current approaches to sustainability might exactly fail because they do not take such possibly hardwired mechanisms account. E.g. a male who foregoes meat and excessive life style appears to have it harder [0], not easier in his romantic life.