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Shortly after the devastation of Katrina, Al Gore was busy making a correlation between hurricanes and global warming in an effort to drive home his claim that higher global CO2 emissions cause an increase in extreme weather events:

Now, the scientific community is warning us that the average hurricane will continue to get stronger because of global warming. A scientist at MIT has published a study well before this tragedy showing that since the 1970s, hurricanes in both the Atlantic and the Pacific have increased in duration, and in intensity, by about 50 %. The newscasters told us after Hurricane Katrina went over the southern tip of Florida that there was a particular danger for the Gulf Coast of the hurricanes becoming much stronger because it was passing over unusually warm waters in the gulf. The waters in the gulf have been unusually warm. The oceans generally have been getting warmer. And the pattern is exactly consistent with what scientists have predicted for twenty years. Al Gore September 2005

Increased and more powerful tropical storm activity has been a mainstream claim of both Al Gore and the IPCC. It was so important to the former Vice President, that he actually photo-shopped a giant hurricane on to the cover of his second global warming book Our Choice. Unfortunately for Al and the IPCC, it looks as though that claim like so many others, just isn’t true.

Research by hurricane scientists may force the UN’s climate panel to reconsider its claims that greenhouse gas emissions have caused an increase in the number of tropical storms.

The benchmark report from the Intergovernmental Panel on Climate Change (IPCC) said that a worldwide increase in hurricane-force storms since 1970 was probably linked to global warming.

It followed some of the most damaging storms in history such as Hurricane Katrina, which hit New Orleans and Hurricane Dennis which hit Cuba, both in 2005.

The IPCC added that humanity could expect a big increase in such storms over the 21st century unless greenhouse gas emissions were controlled.

The warning helped turn hurricanes into one of the most iconic threats of global warming, with politicians including Ed Miliband, the energy secretary, and Al Gore citing them as a growing threat to humanity.

The cover of Gore’s newest book, Our Choice, even depicts an artist’s impression of a world beset by a series of huge super-hurricanes as a warning of what might happen if carbon emissions continue to rise.

However, the latest research, just published in Nature Geoscience, paints a very different picture.

It suggests that the rise in hurricane frequency since 1995 was just part of a natural cycle, and that several similar previous increases have been recorded, each followed by a decline.

Looking to the future, it also draws on computer modelling to predict that the most likely impact of global warming will be to decrease the frequency of tropical storms, by up to 34% by 2100.

Wait Al can’t be wrong!

It does, however, suggest that when tropical storms do occur they could get slightly stronger, with average windspeeds rising by 2-11% by 2100. A storm is termed a hurricane when wind speeds exceed 74mph, but most are much stronger. A category 4 or 5 hurricane such as Katrina generates speeds in excess of 150mph.

“We have come to substantially different conclusions from the IPCC,” said Chris Landsea, a lead scientist at the American government’s National Hurricane Center, who co-authored the report.

He added: ”There are a lot of legitimate concerns about climate change but, in my opinion, hurricanes are not among them. We are looking at a decrease in frequency and a small increase in severity.” Landsea said he regarded the use of hurricane icons on the cover of Gore’s book as “misleading”.

That row dates back to the hurricane season of 2004 when four major hurricanes hit north and central America.

It prompted senior IPCC scientists to give a press conference at Harvard University warning that global warming would cause many more such storms.

The claims attracted worldwide attention but Landsea pointed out there was no science so substantiate them and was so angry that he resigned his post as a senior IPCC author in January 2005, issuing a letter accusing the IPCC of having become “politicised”.

He added in the letter : “All previous and current research in the area of hurricane variability has shown no reliable, long-term trend up in the frequency or intensity of tropical cyclones.”

Sorry Al I guess you can’t just “wish away” the fact that your global warming hoax is falling apart.

For More on the Hoax of Global Warming, This Post by Caleb How is a MUST Read Unsettled Science

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