The IPCC likes to brag about the 2500 scientists who agree with the view that the carbon dioxide concentration in the atmosphere is causing unusual heating of the Earth. Many obsevrors have noted that many of the 2500 are not involved in physics or climatology. Here is a blurb from the blog Gates of Vienna on that subject:

Al Gore and other global warming enthusiasts are fond of reciting that 2,611 scientists have signed a letter stating that global warming poses a serious and real threat. Yet, only about one in ten of the so-called 2611 scientists had scientific expertise. And only 5 out the 2,611 so-called scientists had training in climate, weather or other atmospheric sciences. That is less than 1/2 of one percent. Excuse me, for being underwhelmed.

Perhaps more revealing is that Gore’s list of “scientists” included landscape architects, psychologists, lawyers, a philosopher, a dermatologist, a gynecologist, and a diplomat. On this flimsy basis, as only Al Gore can, he tells us that the “debate is over” and that there is complete agreement.

The truth is that more than 17,000 scientists (not landscape architects, dermatologists or diplomats) have signed a petition stating, in part, that “there is no convincing scientific evidence that human release of carbon dioxide, methane, or other greenhouse gases is causing or will, in the foreseeable future, cause catastrophic heating of the Earth’s atmosphere and disruption of the Earth’s climate.” This petition was circulated by the Oregon Institute of Science and Medicine, an independent research foundation that is not funded by industry. This petition was signed by more than 2,100 physicists, geophysicists, climatologists, meteorologists, and environmental scientists and by more than another 4,400 scientists with expertise on carbon dioxide’s effects on plant and animal life.