Economist Paul Krugman took to the pages of The New York Times on Sunday in order to regurgitate Sierra Club talking points regarding global warming and to castigate the Republican Party for being “anti-science.” As Roger Simon noted, like just about everybody else writing about the issue, Krugman doesn’t bother to explain or understand the science or the nature of the robust scientific debate that has been going on for some time. Instead, he relies on the Left’s preferred method for analyzing scientific issues: a moistened finger held up to the wind.
Krugman’s central thesis is that theory that mankind is causing catastrophic climate change has to be true, because “97 to 98 per cent of scientists” agree that it’s true. You’ll see the “97 to 98 per cent” number appearing quite often now. It’s become a key talking point of the alarmist crowd, as they struggle to regain relevance in a world that has a harder and harder time taking them seriously. But where does that amazing number come from? It arises from a 2009 survey that two University of Illinois researchers conducted. 10,257 Earth scientists responded and, much to the U of I professors’ chagrin, the results were far from satisfying to the alarmist crowd.
Many of the respondents indicated that they believe that natural forces are much more important than mankind’s paltry contributions to climate trends. Some questioned the validity of the models that have been used to predict massive forcing attributable to carbon dioxide and other greenhouse gases. All in all, it wasn’t the kind of response that the researchers were looking for when they were trying to prove consensus. So, the professors decided that 10,180 of the scientists who responded weren’t qualified to comment on the issue because they were merely solar scientists, space scientists, cosmologists, physicists, meteorologists, astronomers and the like. Of the remaining 77 scientists whose votes were counted, 75 agreed with the proposition that mankind was causing catastrophic changes in the climate. And, since 75 is 97.4% of 77, “overwhelming consensus” was demonstrated once again. See Laurence Solomon’s marvelous analysis of the survey for more details.
This attempt to silence dissent across scientific disciplines is a sad and troubling feature of the global warming alarmist movement. As a scientist and a skeptic, I often hear alarmists tell me that I’m not qualified to opine on global warming because I’m merely a chemist. I’m not a climatologist, so my vote should not count. Now, having specialized in air quality work for the past thirty years, having run many dispersion models (related to, but not the same as, climate models) and knowing a fair bit about thermodynamics, I’ll flatter myself to think that I know a whole lot more about the issue than 99% of the people writing about it in the mainstream media. And yet, people like Krugman feel no shame when they speak authoritatively about an issue they don’t understand in the slightest. I’ll make Mr. Krugman a deal: I won’t write about exchange rate instability if he will take a pass on atmospheric science.
There is no question that carbon dioxide and other “greenhouse gases” play a role in the complex climate system that is planet earth. No scientist denies that. But the stupefyingly oversimplification that leftists like Krugman cling to – that global warming is wholly and directly caused by our use of fossil fuels – is about as idiotic as saying that unemployment rates in Arkansas determine growth in national GDP. The global warming question is, in fact, five distinct questions:
1. Is the planet’s climate changing?
2. If so, is the rate of change cause for concern?
3. If so, can human activities contribute to the rate of change?
4. If so, is the degree to which human activities contribute to the rate of change significant compared to other forces?
5. If so, is it wiser to attempt to reduce greenhouse gas emissions that it is to adapt to the changing climate?
Only if one answers all five questions in the affirmative can one justify further reductions in fossil fuel use. When one considers how scientists answer those questions, we find that the number who would answer every one with an unqualified “yes” hardly represents any sort of consensus at all. See the Heartland Institute’s detailed analysis, “You Call This Consensus,” for more.
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