Shifting the goal posts

Before the Berkeley Earth Project key climate change/warming sceptics produced this paper

Instrumental temperature data for the pre-satellite era (1850-1980) have been so widely, systematically, and uni-directionally tampered with that it cannot be credibly asserted there has been any significant “global warming” in the 20th century.

After the Berkeley Earth Project the message became

The issue of “the world is warming” is not one that climate skeptics question, it is the magnitude and causes.

Before the Berkeley Earth Project the message was

I’m prepared to accept whatever result they produce, even if it proves my premise wrong. I’m taking this bold step because the method has promise.

After the Berkeley Earth Project the message became

I accept their papers, and many of their findings, but disagree with some methods and results as is my right.

And that appears to be the only argument of the sceptics, that it is my right.

Despite constant criticism the IPCC have maintained that

"Warming of the climate system is unequivocal."[9] 

"Most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations."[10]

Very likely and likely mean "the assessed likelihood, using expert judgment" are over 90% and over 66%, respectively.[11

What separates the IPCC from those that are sceptical of the IPCC is that the IPCC were able to support their assessment by citing over 6,000 peer-reviewed scientific studies. Sceptics have no evidence to support their claims and rely only on unsupported and untested hypotheses.