How many timeas have you heard that "an overwhelming majority of climate scientists... or scientists... etc. support anthropogenic global warming" as an excuse to drop a GDP tax and regulation bomb on us all. That's a lot bigger than an H bomb.
Here are the real numbers. In 1992, in the book that may win Al Gore a Nobel Peace Prize, believe it or not, the emminent Mr. Gore states that "Only an insignificant fraction of scientists deny the global warming crisis. The time for debate is over. The science is settled."
A Gallup Poll in 1992 showed that 53% of scientists actively involved in Global Warming research did not believe it was occuring, 30% were unsure, and 17% believed it had begun. A Greenpeace poll in the mid 1990's showed 47% of climatologists thaought that an event was imminent, 36% thought it possible at all, and 13% thought it probable.
More recently, the IPCC claims that 2,000 of 2,500 of the World's Top Scientists endorse the IPCC position of Kyoto like remedies, although the IPCC will not release the names, only promising that they will be put online "hopefully by late 2007". By the way, those defined as Top Scientists were those handpicked to review the IPCC results.
Between 1999 and 2000, the Oregon Institute of Science and Medicine organized a petition signed by 17,800 scientists in opposition to Kyoto Protocol.
A November 2006 poll of the 12,000 strong National Registry of Environmental Professionals found that 59% of its members think human activities are largely responsible for the warming that has occured, and only 39% think controlling carbon emmissions should be a priority.
If this is what comprises "consensus" among scientists, then it should be good enough for us. Anything with a low 50% support should be acted upon immediately. Bummer for advocates of capital punishment, abortion on demand, welfare...
A good in depth review of this is at: