Agence France-Presse: US opponents of climate change action are seizing on a record snowfall in Washington in hopes of killing legislation to curb carbon emissions, which already faced uncertain political prospects. Environmentalists have launched a swift counter-attack, pointing out that Olympics host Vancouver is facing a dearth of snow and saying the extreme weather may in fact offer proof, not a rebuttal, of dangerous climate change. With Washington and other eastern cities digging out from the …