Recent record hot years are almost impossible in the absence of human-induced forcings, a
new study shows once again. A multi-national team of scientists led by Andrew King from the University of Melbourne
did a study of hot weather years, and found human influences on heat extremes going back to the 1930s globally, and earlier in some places. The
new paper has just been published in Geophysical Research Letters.
Anthony Watts, a climate conspiracy blogger at WUWT, didn't read the paper, but he decided it made unfounded claims (archived
here). Anthony decided, in his foolishness, that the team, led by a University of Melbourne scientist, and including other researchers from Universities in Melbourne, South Korea, Switzerland, Oxford UK, New Zealand and the New South Wales, must be wrong
because Professor Chris Turney (not an author) led an expedition on a ship that got caught in the ice in Antarctica a couple of years ago. Need I say more about the weirdness of science deniers?
Record hot years influenced by human activity - going back to the 1930s globally
The authors weren't looking at heatwaves (a duration of days), they restricted their study to timescales of at least a month. They performed an analysis of hot years looking at the globe as a whole and selected regions. They found that by using the technique knows as Fractional Attributable Risk (FAR), they could determine years in which there was a detectable anthropogenic influence on especially hot years globally and in different regions of the world.