Certainly one snowfall was neither proof of climate change nor a rebuttal; it was an individual event and not unprecedented. But look at Monday’s damage from downed power lines and trees — the lost productivity and general inconvenience. Think about how unusual it was to contend with as much as a foot of snow on Nov. 26. Then imagine the worldwide impacts of such intensified weather phenomena as melting snow caps, pelting rains, catastrophic heat waves. That’s the troubling future, unless humans take aggressive action to clean the atmosphere of greenhouse gases that are warming the planet.