It'd due to man's burning of fossil fuels.
Please ignore the fact that this type of winter occurs about every 50 years in this country and has been doing that since long before man discovered fossil fuels.
About 250 years ago we came out of a mini-ice age, based on what I've read it was similar to this winter but was more severe and lasted for a long, long time.
If our founding fathers hadn't burned so much gasoline getting to this country that never would have happened
Oh wait, was the mayflower diesel powered?
ROFLMAO