Giant Yellow Jacket Nest

I've seen some large yellow jacket nests in my time, but nothing near what a man found inside a 1955 Chevy in Tallassee, Alabama. The owner of the car said when he first found it, it was about "the size of a spare tire", but when he returned about a month and a half later he found that it had literally consumed the whole inside of the car. Check it out here. This is is just one of many large nests that have been found in recent times. There was a six footer in a Georgia pond and a six foot by eight foot nest in an Alabama mobile home. Experts are trying to figure out why they are building such large nests when normally they get no bigger than a basketball. Some believe it may have something to do with warmer winters. Could it have something to do with........global warming?????