The Galileo of Global Warming

By Robert Tracinski

I have written before about how the left loves to invoke the example of Galileo in order to present themselves as the great defenders of science against all of those knuckle-dragging religious bigots who don’t believe in global warming. But these same people don’t understand science very well themselves (remember amateur neurologist Janeane Garofalo lecturing us about the “limbic brain”?), so they end up using Galileo, a man who defied the “consensus” of his day, as a propaganda talking point to enforce the consensus of today.

It occurred to me a while back that there is something worse about this invocation of Galileo, because there is a modern-day equivalent to Galileo, specifically on the issue of global warming—and he’s on the other side. In this more civilized age, he is thankfully not threatened with torture or any kind of persecution. But he is a pioneer of new and important scientific truths who is being ignored and vilified because his discoveries run counter to the quasi-religious dogma of our day.

That man is the Danish physicist Henrik Svensmark, who seems to have discovered the most important factor that actually regulates Earth’s climate, and who is quietly in the process of proving it.

I linked last year to Svensmark’s latest big breakthrough, but I didn’t get a chance to discuss it much, so I want to give a little more detail now, then show one of the recent consequences of Svensmark’s achievement.

Let me briefly sum up Svensmark’s theory. The temperature of the Earth, he argues, is regulated by the intensity of solar radiation, but not in the obvious way. It is not that the increase is solar radiation heats the Earth directly. (It does, of course, but not to a sufficient degree to explain climate variations.) Rather, an increase in solar radiation extends the Sun’s magnetic field, which shields Earth from cosmic rays (highly energetic, fast-moving charged particles that come from deep space). How does this affect the climate? Here is the crux of Svensmark’s argument. When cosmic rays hit the atmosphere, he argues, their impact on air molecules creates nucleation sites for the condensation of water vapor, leading to an increase in cloud-formation. Since clouds tend to bounce solar radiation back into space, increased cloud cover cools the Earth, while decreased cloud cover makes the Earth warmer.

So if Svensmark is right, lower solar radiation means more cosmic rays, more clouds, and a cooler Earth, while higher solar radiation means fewer cosmic rays, fewer clouds, and a warmer Earth.

Those who have followed the global warming controversy over the years may recall that cloud-formation is one of the major gaps in the computerized climate “models” used by the consensus scientists to predict global warming. They have never had a theory to explain how and why clouds form or to account accurately for their effect on the climate. Svensmark has smashed through this glaring gap in their theory.

Like I said, Svensmark hasn’t just put this theory out there. He has been working to prove it. He has done some studies that attempted to track measurements of cosmic ray flux against surface temperature and cloud cover, with some success. But his big breakthrough last year was a long-awaited experiment at Switzerland’s CERN particle accelerator that demonstrated the most controversial part of Svensmark’s theory.

It is widely accepted that the Sun’s magnetic field helps shield Earth from cosmic rays, and it is also widely accepted that increased cloud cover cools the Earth (though expect this to suddenly come into question as Svensmarks’ theory gains ground). What Svensmark needed to demonstrate was that cosmic rays form nucleation sites that seed clouds.

Hence the aptly named CLOUD experiment performed at CERN last year, with the results published last August. The experiment was actually more than a decade in the making, but as Lawrence Solomon explains, it was help back for years by the scientific bureaucracy because of its potentially unwelcome results.

The results are indeed unwelcome, at least for the advocates of the global warming consensus. Anthony Watts explained the experiment at his blog, Watts Up With That? The CLOUD experiment used CERN’s particle accelerator to send a beam of artificially generated charged particles—simulated cosmic rays—into a gas-filled chamber and then measured the formation of aerosols, the kind of compounds that can serve as cloud nucleation sites. It found a direct and very significant relationship.

This is not a total demonstration of Svensmark’s theory. The Nature paper on the CLOUD experiment notes that “the fraction of these freshly nucleated particles that grow to sufficient sizes to seed cloud droplets, as well as the role of organic vapors in the nucleation and growth processes, remain open questions experimentally.” But last year’s result is a clear demonstration of a crucial step in Svensmark’s theory. It’s certainly a lot farther than the warmthers have ever gotten in demonstrating the physical basis for their theory.

(“Warmther,” by the way, is a coin termed—if I recall correctly—by occasional TIA Daily contributor Tom Minchin. It’s intended to put advocates of the global warming hysteria in the same category as the “truthers” and the “birthers.”)

What impact did the CLOUD experiment have? Well, the global warming establishment set out to make sure it would have no impact. Like I said, this is a more civilized age, so Svensmark and his colleagues will not be subject to an Inquisition. They will just be ignored, for as long as the entrenched establishment can manage to do so.

This campaign began immediately. James Delingpole’s overview of the reaction to CLOUD quotes the statement given to the press by Rolf-Dieter Heuer, Director General of CERN.

I have asked the colleagues to present the results clearly, but not to interpret them. That would go immediately into the highly political arena of the climate change debate. One has to make clear that cosmic radiation is only one of many parameters.

I don’t know what I find more amusing about this quote: the fact that he is directing scientists not to draw conclusions from data, or the fact that he then proceeds to assert his own interpretation of the data, that “cosmic radiation is only one of many parameters.” Well, no, if Svensmark’s theory is right, it is not “only one of many,” it is the central factor, far more important than human emissions of carbon dioxide. But thanks for telling us all ahead of time what we’re supposed to think.

Heuer’s statement is an example of an old warmther practice of releasing scientific results to the media only on the condition that upper-level science bureaucrats, the ones who want to increase or preserve the funding they get from government, provide the politically appropriate “spin” to the press. In this case, the appropriate spin is, “move along, nothing to see here.”

Read the rest here.

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