He has been linked with the narrative that CO2 is associated with the warming of the world's temperature and in the past his work, extensively quoted in IPCC Assessment Reports, has come in for some criticism, most notably by Steve McIntyre.
However in a press release today from the American Geophysical Union, Professor Crowley is quoted for his views of a study suggesting the sun is more linked to climate than previously thought:
"With the new paper, Sirocko and his colleagues have added to the research linking solar variability with climate", said Thomas Crowley, Director of the Scottish Alliance for Geoscience, Environment, and Society, who was not involved with the study.“There is some suspension of belief in this link,” Crowley said, “and this study tilts the argument more towards thinking there really is something to this link. If you have more statistical evidence to support this explanation, one is more likely to say it’s true.” (My emphasis.)
I reported in 2011 that Professor Crowley had softened in his stance in an argument with Steve McIntyre to the point where he proffered an apology.
Signs of change?