Franz Baumann, the new ACUNS President, suggests that while the climate crisis is, in fact, a fossil fuel crisis, the old mantra that mitigating global heating can be achieved without cost, inconvenience, or change is fading. Whatever Big Oil’s rearguard actions, the open question is: Before the climate tips, will whatever is politically possible prove to be ecologically sufficient, or will the ecologically necessary miraculously become politically possible? The answer is if only that plan from Rio would be resuscitated.