Not Natural Variability
Cameron P. Wake, a climatologist at the Climate Change Research Center of the University of New Hampshire, said a 30-year period would include several cycles of multiyear effects like El Niño, with an underlying assumption that climate is stable and varies around a mean. Warming, on the other hand, “is not variability, it’s a long term trend,” Dr. Wake said. “I would say the U.S.D.A. doesn’t want to acknowledge there’s been change.”
That's the difference amateur critics can't make. They both don't want to, under some sort of skeptical critieria that doesn't meet standard scientific skeptic criteria, and don't know the difference.