The "97 percent" figure in the Zimmerman/Doran survey represents the views of only 79 respondents who listed climate science as an area of expertise and said they published more than half of their recent peer-reviewed papers on climate change. Seventy-nine scientists—of the 3,146 who responded to the survey—does not a consensus make.

In 2010, William R. Love Anderegg, then a student at Stanford University, used Google Scholar to identify the views of the most prolific writers on climate change. His findings were published in Proceedings of the National Academies of Sciences. Mr. Love Anderegg found that 97% to 98% of the 200 most prolific writers on climate change believe "anthropogenic greenhouse gases have been responsible for 'most' of the 'unequivocal' warming." There was no mention of how dangerous this climate change might be; and, of course, 200 researchers out of the thousands who have contributed to the climate science debate is not evidence of consensus.

In 2013, John Cook, an Australia-based blogger, and some of his friends reviewed abstracts of peer-reviewed papers published from 1991 to 2011. Mr. Cook reported that 97% of those who stated a position explicitly or implicitly suggest that human activity is responsible for some warming. His findings were published in Environmental Research Letters.

Mr. Cook's work was quickly debunked. In Science and Education in August 2013, for example, David R. Legates (a professor of geography at the University of Delaware and former director of its Center for Climatic Research) and three coauthors reviewed the same papers as did Mr. Cook and found "only 41 papers—0.3 percent of all 11,944 abstracts or 1.0 percent of the 4,014 expressing an opinion, and not 97.1 percent—had been found to endorse" the claim that human activity is causing most of the current warming. Elsewhere, climate scientists including Craig Idso, Nicola Scafetta, Nir J. Shaviv and Nils- Axel Morner, whose research questions the alleged consensus, protested that Mr. Cook ignored or misrepresented their work.

Rigorous international surveys conducted by German scientists Dennis Bray and Hans von Storch—most recently published in Environmental Science & Policy in 2010—have found that most climate scientists disagree with the consensus on key issues such as the reliability of climate data and computer models. They do not believe that climate processes such as cloud formation and precipitation are sufficiently understood to predict future climate change.

Surveys of meteorologists repeatedly find a majority oppose the alleged consensus. Only 39.5% of 1,854 American Meteorological Society members who responded to a survey in 2012 said man-made global warming is dangerous.

Finally, the U.N.'s Intergovernmental Panel on Climate Change—which claims to speak for more than 2,500 scientists—is probably the most frequently cited source for the consensus. Its latest report claims that "human interference with the climate system is occurring, and climate change poses risks for human and natural systems." Yet relatively few have either written on or reviewed research having to do with the key question: How much of the temperature increase and other climate changes observed in the 20th century was caused by man-made greenhouse-gas emissions? The IPCC lists only 41 authors and editors of the relevant chapter of the Fifth Assessment Report addressing "anthropogenic and natural radiative forcing."

Of the various petitions on global warming circulated for signatures by scientists, the one by the Petition Project, a group of physicists and physical chemists based in La Jolla, Calif., has by far the most signatures—more than 31,000 (more than 9,000 with a Ph.D.). It was most recently published in 2009, and most signers were added or reaffirmed since 2007. The petition states 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."

We could go on, but the larger point is plain. There is no basis for the claim that 97% of scientists believe that man-made climate change is a dangerous problem.

12 months old opinion piece, originally from the heartland foundation. Should be in the extremist section.


https://www.heartland.org/policy-documents/research-commentary-myth-global-warmi...

____ wrote on Jul 21^st, 2015 at 6:32pm:



how does being a year old change anything since it was produced and published in a peer-reviewed publication?

too much credibility for you to cope with?

longweekend58 wrote on Jul 21^st, 2015 at 6:41pm:




Heartland Institute

The Heartland Institute, according to the Institute's web site, is a nonprofit "think tank" that questions the reality and import of climate change, second-hand smoke health hazards, and a host of other issues that might seem to require government regulation. A July 2011 Nature editorial points out the group's lack of credibility:
"Despite criticizing climate scientists for being overconfident about their data, models and theories, the Heartland Institute proclaims a conspicuous confidence in single studies and grand interpretations....makes many bold assertions that are often questionable or misleading.... Many climate sceptics seem to review scientific data and studies not as scientists but as attorneys, magnifying doubts and treating incomplete explanations as falsehoods rather than signs of progress towards the truth. ... The Heartland Institute and its ilk are not trying to build a theory of anything. They have set the bar much lower, and are happy muddying the waters."[1]
An August 2014 Travis County Texas court ruling highlighted President and CEO Joseph Bast's lack of credibility and reliability:
"Mr. Joseph Bast, president and CEO of the Heartland Institute, testified for the Intervenors regarding the Texas Taxpayers’ Savings Grant Programs (“TTSGP”), a school voucher bill that failed in the 82nd Legislative Session. As a threshold matter, this Court finds that Mr. Bast is not a credible witness and that he did not offer reliable opinions in this matter. While Mr. Bast described himself as an economist, he holds neither undergraduate nor graduate degrees in economics, and the highest level of education he completed was high school. Mr. Bast testified that he is 100% committed to the long-term goal of getting government out of the business of educating its own voting citizens. Further, his use of inflammatory and irresponsible language regarding global warming, and his admission that the long term goal of his advocacy of vouchers is to dismantle the “socialist” public education system further undermine his credibility with this Court."[2]

www.sourcewatch.org/index.php/Heartland_Institute

____ wrote on Jul 21^st, 2015 at 6:48pm:


Well that certainly throws a spanner in longies argument .

longweekend58 wrote on Jul 21^st, 2015 at 6:42pm:

longy knows abbott is feeling the heat 

Very_Vinnie wrote on Jul 21^st, 2015 at 7:43pm:



Which paper Zimmerman?

'

    Q1: “When compared with pre-1800s levels, do you think that mean global temperatures have generally risen, fallen, or remained relatively constant?”   76 of 79 (96.2%) answered “risen.”

    Q2: “Do you think human activity is a significant contributing factor in changing mean global temperatures?”   75 of 77 (97.4%) answered “yes.”

Not CO2 specifically, but land use change etc. And a very small sample. Error values?

Anderegg 97 - 98% of 200. Again a small sample. Error values?

John Cook 0.03% - wow huge.