The latest report from the Intergovernmental Panel on Climate Change, the internationally accepted authority on the subject, concludes that the climate system has warmed dramatically since the 1950s, and that scientists are 95% to 100% sure human influence has been the dominant cause. In the Northern Hemisphere, 1983 to 2012 was likely the warmest 30-year period of the past 1,400 years, the IPCC found.
The infamous "hockey stick" graph showing global temperatures rising over time, first slowly and then sharply, remains valid.
The [Hockey Stick] graph shows a long, relatively unwavering line of temperatures across the last millennium (the stick), followed by a sharp, upward turn of warming over the last century (the blade). The upward turn implied that greenhouse gases had become so dominant that future temperatures would rise well above their variability and closely track carbon dioxide levels in the atmosphere....I knew that wasn't the case.
Michael Mann, a climatologist who directs the Earth System Science Center at Pennsylvania State University, agreed that it's too early to tell.
Michael E. Mann, a prominent climatologist, was only slightly more cautious. He said, "If you're a betting person -- or the insurance or reinsurance industry, for that matter -- you'd probably go with a prediction of greater frequency and intensity of tornadoes as a result of human-caused climate change."
Muller's announcement last year that the Earth is indeed warming brought him up to date w/ where the scientific community was in the the 1980s. His announcement this week that the warming can only be explained by human influences, brings him up to date with where the science was in the mid 1990s. At this rate, Muller should be caught up to the current state of climate science within a matter of a few years!
It would seem that Richard Muller has served as a useful foil for the Koch Brothers, allowing them to claim they have funded a real scientist looking into the basic science, while that scientist -- Muller -- props himself up by using the "Berkeley" imprimatur (UC Berkeley has not in any way sanctioned this effort) and appearing to accept the basic science, and goes out on the talk circuit, writing op-eds, etc., systematically downplaying the actual state of the science, dismissing key climate change impacts and denying the degree of risk that climate change actually represents. I would suspect that the Koch Brothers are quite happy with Muller right now, and I would have been very surprised had he stepped even lightly on their toes during his various interviews, which he of course has not. He has instead heaped great praise on them, as in this latest interview.