An anti-nuclear, Toronto-based, urban-loving, 1970s peace activist who opposes subsidies to the oil industry might be the last person expected to detail cracks in the science of global warming.

But Lawrence Solomon has done just that in a short book with a long subtitle: The Deniers: The world-renowned scientists who stood up against global warming hysteria, political persecution, and fraud (and those who are too fearful to do so).

The spark for the book came after an American TV reporter compared those who question the Kyoto Protocol to Holocaust deniers. But Solomon wondered about that so he sought out the experts in specific fields to garner their views.

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Consider Dr. Edward Wegman, asked by the U.S. Congress to assess the famous "hockey stick" graph from Michael Mann, published by the UN's International Panel on Climate Change (IPCC), which purported to show temperatures as mostly constant over the past 1,000 years -- except for a spike in the last century.

The IPCC claimed the hockey stick "proved" unique 20th-century global warming. But it didn't. Wegman, who drew on the initial skepticism of two Canadians who questioned Mann's statistical handling, found that his "hockey stick" was the result of a statistical error -- the statistical model had mined data to produce the hockey stick and excluded contrary data.

That mistake occurred not because Mann was deceptive or a poor scientist; he's an expert in the paleoclimate community as were those who reviewed his paper. But that was the problem: The paleoclimate scientists were trapped in their own disciplinary ghetto and not up to speed on the latest, most appropriate statistical methods.

Is Wegman the scientific equivalent of medical quack? No. His CV includes eight books, more than 160 published papers, editorships of prestigious journals, and past presidency of the International Association of Statistical Computing, among other distinctions.

Opinions in The Deniers vary dramatically and Solomon, a non-scientist, does not try to settle the disputes. He instead attempts to give readers insight into how non-settled and fragmentary the science is on climate change.

For example, think the polar icecaps are melting? That's true at the North Pole but it's not certain at the South Pole, according to Dr. Duncan Wingham. A portion of Antarctica's northern peninsula is melting. But that's a tiny slice of the 14-million-square-kilometre continent. And confounding evidence exists. Since the inception of the South Pole research station in 1957, recorded temperatures have actually fallen.

Wingham is cautious. He doesn't deny global warming might exist. But his data show the Antarctic ice sheet is growing, not shrinking, and the chapter on why ice measurements are tricky is another fine, informative part of The Deniers.

Is Wingham a flake, a denier in league with flat-earthers? Only if you think the chair of the department of space and climate physics and head of earth sciences at University College London, and a member of the Earth Observation Experts Group, among other qualifications, qualifies for such a label.

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