A Summary of the Blunders.

The WSJ has a nice summary of the mistakes found so far in the IPCC report. Far from being the most scientific report in the world, it is the least scientific report in the world. Far from being the work of the world’s best scientists, it is the work of the world’s most fanatical environmentalists.

Take the rain forest claim. In its 2007 report, the IPCC wrote that “up to 40% of the Amazonian forests could react drastically to even a slight reduction in precipitation; this means that the tropical vegetation, hydrology and climate system in South America could change very rapidly to another steady state.”But as Jonathan Leake of London’s Sunday Times reported last month, those claims were based on a report from the World Wildlife Fund, which in turn had fundamentally misrepresented a study in the journal Nature. The Nature study, Mr. Leake writes, “did not assess rainfall but in fact looked at the impact on the forest of human activity such as logging and burning.”

The IPCC has relied on World Wildlife Fund studies regarding the “transformation of natural coastal areas,” the “destruction of more mangroves,” “glacial lake outbursts causing mudflows and avalanches,” changes in the ecosystem of the “Mesoamerican reef,” and so on. The Wildlife Fund is a green lobby that believes in global warming, and its “research” reflects its advocacy, not the scientific method.

The IPCC has also cited a study by British climatologist Nigel Arnell claiming that global warming could deplete water resources for as many as 4.5 billion people by the year 2085. But as our Anne Jolis reported in our European edition, the IPCC neglected to include Mr. Arnell’s corollary finding, which is that global warming could also increase water resources for as many as six billion people.

The IPCC report made aggressive claims that “extreme weather-related events” had led to “rapidly rising costs.” Never mind that the link between global warming and storms like Hurricane Katrina remains tenuous at best. More astonishing (or, maybe, not so astonishing) is that the IPCC again based its assertion on a single study that was not peer-reviewed. In fact, nobody can reliably establish a quantifiable connection between global warming and increased disaster-related costs. In Holland, there’s even a minor uproar over the report’s claim that 55% of the country is below sea level. It’s 26%.

Meanwhile, one of the scientists at the center of the climategate fiasco has called into question other issues that the climate lobby has claimed are indisputable. Phil Jones, who stepped down as head of the University of East Anglia’s Climatic Research Unit amid the climate email scandal, told the BBC that the world may well have been warmer during medieval times than it is now.

This raises doubts about how much our current warming is man-made as opposed to merely another of the natural climate shifts that have taken place over the centuries. Mr. Jones also told the BBC there has been no “statistically significant” warming over the past 15 years, though he considers this to be temporary.

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All of this matters because the IPCC has been advertised as the last and definitive word on climate science. Its reports are the basis on which Al Gore, President Obama and others have claimed that climate ruin is inevitable unless the world reorganizes its economies with huge new taxes on carbon. Now we are discovering the U.N. reports are sloppy political documents intended to drive the climate lobby’s regulatory agenda.

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