Pouring cold water on hot air
In a remarkable editorial over the weekend, Australian scientist David Evans renews his argument against government-mandated restrictions on carbon emissions, noting that there is little evidence to show they have anything to do with climate change.
If you’ve followed my sporadic coverage of climate change alarmism, you may recall him as a scientist who worked on carbon accounting for the Australian government, and changed his mind once he saw the evidence on which global warming alarmism was (or rather, was not) based.
Evans was one of the signatories of the open letter to UN secretary-general Ban Ki-Moon, on the occasion of the climate change junket in Bali, late last year. He was among several people who weren’t welcome. He has written a paper (link in PDF) in support of his position that CO2 does not cause global warming, has written a more accessible alternative, and has also penned a remarkable confession: I Was On the Global Warming Gravy Train.
His editorial is worth reading in full, but here are some key points:
When I started that job [of writing Australia’s carbon accounting model] in 1999 the evidence that carbon emissions caused global warming seemed pretty good: CO2 is a greenhouse gas, the old ice core data, no other suspects.
The evidence was not conclusive, but why wait until we were certain when it appeared we needed to act quickly? Soon government and the scientific community were working together and lots of science research jobs were created. We scientists had political support, the ear of government, big budgets, and we felt fairly important and useful (well, I did anyway). It was great. We were working to save the planet.
But since 1999 new evidence has seriously weakened the case that carbon emissions are the main cause of global warming, and by 2007 the evidence was pretty conclusive that carbon played only a minor role and was not the main cause of the recent global warming. As Lord Keynes famously said, “When the facts change, I change my mind. What do you do, sir?”
There has not been a public debate about the causes of global warming and most of the public and our decision makers are not aware of the most basic salient facts:
1. The greenhouse signature is missing. We have been looking and measuring for years, and cannot find it. […]
2. There is no evidence to support the idea that carbon emissions cause significant global warming. None. There is plenty of evidence that global warming has occurred, and theory suggests that carbon emissions should raise temperatures (though by how much is hotly disputed) but there are no observations by anyone that implicate carbon emissions as a significant cause of the recent global warming.
3. The satellites that measure the world’s temperature all say that the warming trend ended in 2001, and that the temperature has dropped about 0.6C in the past year (to the temperature of 1980). […]
4. The new ice cores show that in the past six global warmings over the past half a million years, the temperature rises occurred on average 800 years before the accompanying rise in atmospheric carbon. Which says something important about which was cause and which was effect.
None of these points are controversial. The alarmist scientists agree with them, though they would dispute their relevance.
[…]
Until now the global warming debate has merely been an academic matter of little interest. Now that it matters, we should debate the causes of global warming.
So far that debate has just consisted of a simple sleight of hand: show evidence of global warming, and while the audience is stunned at the implications, simply assert that it is due to carbon emissions.
In the minds of the audience, the evidence that global warming has occurred becomes conflated with the alleged cause, and the audience hasn’t noticed that the cause was merely asserted, not proved.
[…]
The world has spent $50 billion on global warming since 1990, and we have not found any actual evidence that carbon emissions cause global warming. Evidence consists of observations made by someone at some time that supports the idea that carbon emissions cause global warming. Computer models and theoretical calculations are not evidence, they are just theory.
[…]
The onus should be on those who want to change things to provide evidence for why the changes are necessary. The Australian public is eventually going to have to be told the evidence anyway, so it might as well be told before wrecking the economy.
Don’t expect any of this to make an ounce of difference. To turn a typical alarmist point against them, too many people are invested in the climate alarmism lobby. Some merely for its value in obtaining public money for research, but others, like Al Gore, quite literally. Politicians love the idea of climate change, because it gives them at once an opportunity to appear saintly and selfless, and an excuse to impose measures that increase their power and reward their political benefactors. Many companies buy into it because it gives them marketing collateral, and allows them to gain a slice of a “green” products pie that is expect to top $688 billion by 2010 (link in PDF), not to mention all the spinoffs from trade in an entirely new class of assets — carbon credits — simply conjured out of thin air by governments. The media loves it because, well, scary stories sell magazines.
Expect David Evans to be attacked over everything except the substance of his arguments, by all these people with undeniable vested interests of their own.
But he is right: if climate alarmists demand that the world drastically limit its use of fossil energy, and significantly increase the cost of production — which is the stuff that provide people with food, housing and healthcare, and lift the poor out of poverty — the onus is on them to prove why he is wrong and their solution is unavoidably necessary. And even if he is wrong, they should show why there is no alternative solution to large-scale, invasive government regulation, such as relying on technological innovation and free markets to solve whatever problems people might encounter as a result of global warming.
Their plan is a staggering price to pay for mere precaution, especially when it appears that their fears are based on little more than elaborate speculation. In fact, the precautionary principle — that self-contradictory rule to which environmentalists so often appeal — itself cautions against their grand, megalomaniacal, but ultimately vain schemes to change the climate. But it won’t stop them trying to run your life, scare your children and rob you blind.
Update: Fixed a missing close quote that cut half the paragraph starting with, “Don’t expect any of this to make an ounce of difference.” Proof-reading is under-rated and sadly neglected, on occasion. My apologies.















Ladies, gentlemen, I give you Lord Monckton. Or, to be more precise, the Third Viscount Monckton of Brenchley. A Scottish member of the House of Lords, Monckton was born Christopher Walter. He is a descendant of a member of Churchill’s cabinet who founded the law firm Monckton Chambers, a licenced day-skipper with the Royal Yacht Association, a puzzle-setter of considerable renown, a member of the Worshipful Company of Broderers (one of London’s great Livery Companies), and a Knight of the Order of Malta. As a Catholic Tory, he has startlingly mediaeval views on handling deadly epidemics, which suggests that when he does see a crisis, he’s all for acting in dramatic fashion. On the upside, he is opposed to European political union and thinks it’s a good idea that people own their own homes. Oh, and he’s a gadfly around Al Gore.
