The period in question being from 1951 to 2010. You all probably recognise the above statement from the IPCC WG1 report: The human induced contribution to warming is similar to the observed warming over the period. In other words, 100% of the warming from 1951 to 2010 is caused by humans.
Judith Curry is clear that she is unclear about clear science
That was written in 2013. Judith Curry today quoted Jeb Bush and wrote that he "gets it exactly right" (my emphasis):
As he has before, Bush acknowledged “the climate is changing” but stressed that it’s unknown why. “I don’t think the science is clear of what percentage is man-made and what percentage is natural. It’s convoluted,” he said at a house party in Bedford, New Hampshire.
...Jeb gets it exactly right. There are two broad hypotheses for recent climate change: human causes and natural causes (with numerous sub-hypotheses contained within). The climate debate is dominated by the premature carving in stone of a theory that humans are the dominant cause of recent climate change.
What? You don't believe a Professor who is a climate scientist would get it so wrong? Look for yourself.
