I was reading Ken's 'my parachute won't open' site the other day and stumbled across some answers he gave to a sceptic that suggest Ken didn't have a clue what he was talking about.
It's not the first time we've caught Ken talking rubbish.
I couldn't at the time be bothered addressing this latest example, but now Ken's popped up in this thread here spouting similar unscientific nonsense.
Specifically, he rattles off his calculations of human CO2 emissions vs natural (wrong incidentally) and then concludes with a massive mental leap:
"That is, human climate forcing is 10,000 times more powerful than natural"
Ken, you are so far off beam on the 10,000 times more forcing than natural that it really does raise genuine questions over whether your criticism of sceptics has been founded on a total misunderstanding of climate science.
So Ken, can you please reconcile your claim – “human climate forcing is 10,000 times more powerful than natural” - with this from New Scientist writer Fred Pearce:
“Some of the climate scientists gathered in Geneva admitted that...natural variability is at least as important (50% influence or higher) as the long term climate changes from global warming.”
No matter how you want to spin it Ken, you won’t find a credible climate scientist who’ll put his name to your statement that human GHG emission forcings are “10,000 times more powerful” than natural forcings. Not one. I don’t even think Gareth Renowden would be stupid enough to back you on this. A number of studies are suggesting natural forcings are currently 50% of the measured impact or more, which is why we get graphs like this:
Now again, it doesn't matter how you spin this. If YOUR statement about anthropogenic GHG forcings being "10,000 times more powerful than natural" were true, the rising CO2 in that graph would be dragging temperatures up no trouble at all.
The Journal of Climate published a study late January noting that natural forcings appear to be outgunning CO2 and methane at present, by a considerable margin, and the study authors note: “Earth’s climate may be less sensitive to rising greenhouse gases than assumed”.
Another study, published in Science around the same time, found a similar effect taking place, and as one report put it, “Susan Solomon, the respected climate scientist who led the research...did point out that the research does allude to human emissions having a much smaller role in climate change than previously thought, and serves as a warning to climate modelers who ‘over interpret the results’.”
Ouch. 10,000 times more powerful?
You actually need to read Air Con with an objective, scientist’s eye rather than thinking Renowden successfully debunked it.
You might recall, for example, his attacks on me such as this:
"…oceans are not responding to heat somehow stored from an earlier period — they respond to heat as it arrives."
In one of my posts I took him to pieces on this: http://briefingroom.typepad.com/the_briefing_room/2009/05/laughing-at-the-loon.html
But I was interested to re-read the AR4 WG-1 report yesterday and find this as well:
“Thermal expansion would continue for many centuries, due to the time required to transport heat into the deep ocean.”
I’m beginning to wonder if you and Gareth have actually read the WG-1 reports, or whether you all went straight to the Summary for Policymakers to get your scientific understanding and missed the detail...
Some other howlers from Ken, which I will proceed to debunk over the next day or so in edits to this post. If anyone else wants to show Ken some of the scientific studies on these points, you are welcome:
"CO2 proves to be the major contributor to current warming."
"Isnt Urban Heat Island effect a valid concern when looking at temp measuring site readings? Yes, it had been investigated and is one reason why some sites are not included. Climate scientists are specialists in their field. They are aware of these sorts of problems and have developed procedures for handling them"
"Did the Medieval Warm Period happen? Seems so, but restricted to regions. At least this is what paleoclimate evidence us telling us. The best evidence indicates that current temperatures are greater than they have been over about 1000 years, probably more"
"David I don’t have that experience. If anything I keep hearing that there was a global MWP – but not from scientific sources. When I look into the evidence I find that nothing beyond regional effects are clear. Eg Northern Europe but not in Southern Europe"
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