http://ossfoundation.us/projects/environment/global-warming/myths/31000-scientists-say-no-convincing-evidence
31,000 scientists say "no convincing evidence".31,000 scientists reject global warming and say "no convincing evidence" that humans can or will cause global warming? But polls show that of scientists working in the field of climate science, and publishing papers on the topic: 97% of the climate scientists surveyed believe “global average temperatures have increased†during the past century; and 97% think human activity is a significant contributing factor in changing mean global temperatures. What is the significance of these statistics?
While polls of scientists actively working in the filed of climate science indicate strong general agreement that Earth is warming and human activity is a significant factor, 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.