31,000 scientists say "no convincing evidence".
Scientific Consensus on Global Warming
While polls of scientists actively working in the filed of climate science indicate strong general agreement that the earth is warming and human activity is a significant factor, the internet is buzzing with blog posts that say 31,000 scientists say there is "no convincing evidence" that humans can or will cause "catastrophic" heating of the atmosphere.
This claim originates from the Oregon Institute of Science and Medicine, which has an online petition (petitionproject.org) that states:
We urge the United States government to reject the global warming agreement that was written in Kyoto, Japan in December, 1997, and any other similar proposals. The proposed limits on greenhouse gases would harm the environment, hinder the advance of science and technology, and damage the health and welfare of mankind.
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. Moreover, there is substantial scientific evidence that increases in atmospheric carbon dioxide produce many beneficial effects upon the natural plant and animal environments of the Earth.
The petition form itself lends a clue as to the nature of the petition. Judging by the form below, one notes that one only needs to mark a check box to show that one has a Ph.D., M.S., or B.S. degree, and then fill in the fields.
Since the results are not verifiable, there is no way to know how many signers have actually earned their degree. Therefore, the integrity of the petition is at the very least, questionable.
Do '31,000 scientists say global warming is not real'? Maybe. but how important a number is that? They are not talking about only climate scientists. You could have a PhD in anthropology or religion, but what expertise does one have in climatology? That is the more important question.
WHAT DO SCIENTISTS REALLY THINK?
What is notable is that the polls indicate there is a perspective difference between working climate scientists and scientists not working in the field climate. When one examines the experts in the field, one sees a significant divergence from the general view. So the more important question for us is, what do 'expert' climate scientists think?
2009 - Examining the Scientific Consensus on Climate Change
1. When compared with pre-1800s levels, do you think that mean global temperatures have generally risen, fallen, or remained relatively constant?
2. Do you think human activity is a significant contributing factor in changing mean global temperatures?
- 90% of participants answered “risen” to question 1.
- 82% answered 'yes' to question 2.
Of those with expertise in climate science:
- 96.2% (76 of 79) answered “risen” to question 1.
- 97.4% (75 of 77) answered yes to question 2.
Source: EOS, TRANSACTIONS AMERICAN GEOPHYSICAL UNION, VOL. 90, NO. 3, P. 22, 2009
2009 Pew Research Center Poll
- 84% of scientists say the earth is warming because of human activity.
Asked if they regarded global warming as a very serious problem?
- Scientists - 70%
- Public - 47%
Source: Pew Research Center
2008 Poll
Scientists agree that humans cause global warming?
- 97% of the climate scientists surveyed believe “global average temperatures have increased” during the past century.
- 84% percent say they personally believe human-induced warming is occurring.
- 74% agree that “currently available scientific evidence” substantiates its occurrence.
- 5% believe that that human activity does not contribute to greenhouse warming; the rest are unsure.
Climate scientists are skeptical of the media
- 1% of climate scientists rate either broadcast or cable television news about climate change as “very reliable.”
Source: STATS Poll (+/-4%), George Mason University
1991 Poll
Changing scientific opinion We repeated several of their questions verbatim, in order to measure changes in scientific opinion over time. On a variety of questions, opinion has consistently shifted toward increased belief in and concern about global warming. Among the changes:
In 1991 the Gallup organization conducted a telephone survey on global climate change among 400 scientists drawn from membership lists of the American Meteorological Association and the American Geophysical Union.
Source: George Mason University
