Hot debate on global warming
Fred Pearce of New Scientist has put the cat among the penguins with a recent piece about global warming.
He quotes climate modeller Mojib Latif telling the UN World Climate Conference in Geneva that we could be entering a decade, or maybe two decades, of global cooling.
I have no opinion about the truth or otherwise of man-made global warming: I used to be equivocal but now I really don’t know what to think. (This paragraph is inserted to prevent the climate change ideologues classifying me as a denier, which is close to being a wife-beater in the modern catechism.)
But I do know that if the world cools for the next twenty years it is going to be a political impossibility to get the changes in human behaviour needed to control climate change. People won’t vote for a hair shirt to save their immortal souls: only to save their lives, or their children’s.
Bear in mind that average annual global temperatures have shifted little for the past decade (see the graph below, from the UK Met Office). That is why climate campaigners have stopped saying that it’s been the hottest year on record and have started saying it’s been the hottest decade.
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Global warming is not incompatible with periods of cooling, since short-term trends can overwhelm the long term rise. The graph shows the long-term trend is up, the short-term trend flat or declining. But if this flat patch lasts another decade or two, sceptics are going to have a field day.
Some have questioned whether Pearce quoted Dr Latib correctly. But that hardly matters, as he is on record in published papers saying the same thing. And a recent paper in Geophysical Research Letters by Kyle Swanson and Anastasios Tsonis from the University of Wisconsin-Milwaukee also suggests that a shift has occurred in the climate’s behaviour.
Climate change is hard to forecast on a decadal scale, the point Dr Latib was making in his Geneva talk. “In many ways we know more about what will happen in the 2050s than next year” Pearce quotes Vicky Pope of the UK Met Office saying.
Be that as it may, it’s clear that if Dr Latib is right, arguing the case for fundamental changes in lifestyle is going to become harder, as if it wasn’t hard enough already. Is that a heretical thing to say? I hope not, because I can’t bear the thought of being monstered by George Monbiot.
Nobody minds the campaigners proclaiming the truth of the science behind man-made global warming. But I do slightly resent the way they seem to believe they own it.

Alex (not verified) wrote,
Wed, 23/09/2009 - 21:28
So you're not a "denier" but you write an article that seems more negative towards the science on global warming, and then conclude with:
"But I do slightly resent the way they seem to believe they own it."
Maybe you're not a "denier", but any causal reader of this piece will see you have a greater affinity for that "side".
Anonymous (not verified) wrote,
Wed, 24/03/2010 - 20:06
See that dip in the graph from 1940 to 1960? in the 1970s people thought that indicated that we were going into a new ice age: http://en.wikipedia.org/wiki/Global_cooling
Matt Andrews (not verified) wrote,
Fri, 26/03/2010 - 04:08
I agree with the social commentary in this piece; if indeed there were, extraordinarily, a hiatus in warming for a couple of decades, it would be very difficult to bring about sufficient action. However, no such hiatus has happened, nor is it seriously suggested as being likely.
Mojib Latif did not predict, nor anticipate, that we will have a period of a decade or more of cooling. In fact he has been at pains to point out that his projections have no validity beyond around 2015:
http://climateprogress.org/2009/10/01/interview-with-dr-mojib-latif-glob...
The Swanson and Tsonis paper has been widely debunked:
http://www.realclimate.org/index.php/archives/2009/07/warminginterrupted...
The fundamental warming trend has actually continued unabated:
http://data.giss.nasa.gov/gistemp/paper/gistemp2010_draft0319.pdf (2.6Mb)
See this article using statistical analysis (modelling the natural variability as an ARMA(1,1) process) to establish that, given the current warming trend and the extent of the short-term natural variability in global temperatures, you need data of more than 15 years to establish statistical significance; anything of shorter duration than that should probably be treated as being most likely due to natural fluctuation rather than any shift in the warming trend.
http://tamino.wordpress.com/2009/12/15/how-long/
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