Leave natural systems undisturbed

US still emits vast amounts of carbon dioxide; 1992 levels are way too high. Part of this year’s uptick in renewables came because higher water levels in areas formerly affected by severe drought meant hydroelectric facilities could produce more power, so similarly large increases in green power generation might be harder in future years. An unusually warm winter reduced heating-related emissions. Natural variability, of course, still plays a predominant role in the weather. But global warming will make unusual phenomena more usual in a wide variety of natural systems humans would be better off not disturbing.