I must admit I was initially sceptical that the “Climategate” revelations would have much of an impact on our approach to “climate change.” Too many — politicians, environmentalists, businesses, teachers, etc. — had too much invested in the notion that the activities of mankind are destroying the planet and something, therefore, has to been done, and done quickly.

It is probably too soon to tell whether climate alarmism is dead, but its proponents are certainly on the defensive. Encouragingly, even the mainstream media, which until this point has been the key purveyor of the climate-change creed, has begun to ask serious questions about the science behind it.

As Bloomberg notes, climate-change fervor is cooling.

The latest blow to those urging action against global warming came last week, when Yvo de Boer said he would step down as United Nations climate chief, two months after 193 countries meeting in Copenhagen failed to reach a binding agreement on curbing greenhouse gases.

‘Sad Day’

The resignation may reduce the possibility that a worldwide market aimed at reducing carbon emissions is within reach, said Trevor Sikorski, an emissions analyst for Barclays Capital in London.

“It’s a sad day for the carbon market, and we’ll be lucky to get somebody with Yvo’s dedication and hard work as a successor,” Sikorski said.

UN carbon credits have fallen 13 percent on the European Climate Exchange in London since the start of the Copenhagen meeting, which was aiming to set limits for emissions after 2012. The NEX index tracking shares of 86 companies involved in clean energy has tumbled 12 percent since the talks.

Also last week, ConocoPhillips, BP Plc and Caterpillar Inc. said they will quit the U.S. Climate Action Partnership, a group of companies created in 2007 to push for legislation to reduce carbon pollution.

Let’s hope cooler heads prevail. Catastrophic climate change is a myth. There are many good reasons to lessen our dependence on carbon-based sources of energy. But ultimately, if alternative energy sources are to become commonplace, it will be to our benefit if economics drives their success rather than political fiat guided by myth.