Award-winning climate hoax scientist Gavin Schmidt pulls a critical number out of his posterior: Maximum amplitude of the internal variability over the last 40 years is roughly .1 degrees C

Kudos to NASA's Gavin Schmidt, the Heart of RealClimate, for Winning Major New AGU Climate Communications Prize | ThinkProgress

“Gavin, In your opinion, what percentage of global warming is due to human causes vs. natural causes?”:

Over the last 40 or so years, natural drivers would have caused cooling, and so the warming there has been (and some) is caused by a combination of human drivers and some degree of internal variability. I would judge the maximum amplitude of the internal variability to be roughly 0.1 deg C over that time period, and so given the warming of ~0.5 deg C, I’d say somewhere between 80 to 120% of the warming. Slightly larger range if you want a large range for the internal stuff. – gavin