Global Warming-- Signed, Sealed, and Delivered
Scientists agree: The Earth is warming, and human activities are the principal cause.
by Naomi Oreskes
An Op-Ed article in the Wall Street Journal a month ago claimed that a published study affirming the existence of a scientific consensus on the reality of global warming had been refuted. This charge was repeated again last week, in a hearing of the House Committee on Energy and Commerce.
I am the author of that study, which appeared two years ago in the journal Science, and I'm here to tell you that the consensus stands. The argument put forward in the Wall Street Journal was based on an Internet posting; it has not appeared in a peer-reviewed journal — the normal way to challenge an academic finding. (The Wall Street Journal didn't even get my name right!)
My study demonstrated that there is no significant disagreement within the scientific community that the Earth is warming and that human activities are the principal cause.
Papers that continue to rehash arguments that have already been addressed and questions that have already been answered will, of course, be rejected by scientific journals, and this explains my findings. Not a single paper in a large sample of peer-reviewed scientific journals between 1993 and 2003 refuted the consensus position, summarized by the National Academy of Sciences, that "most of the observed warming of the last 50 years is likely to have been due to the increase in greenhouse gas concentrations."
Since the 1950s, scientists have understood that greenhouse gases produced by burning fossil fuels could have serious effects on Earth's climate. When the 1980s proved to be the hottest decade on record, and as predictions of climate models started to come true, scientists increasingly saw global warming as cause for concern.
In 1988, the World Meteorological Assn. and the United Nations Environment Program joined forces to create the Intergovernmental Panel on Climate Change to evaluate the state of climate science as a basis for informed policy action. The panel has issued three assessments (1990, 1995, 2001), representing the combined expertise of 2,000 scientists from more than 100 countries, and a fourth report is due out shortly. Its conclusions — global warming is occurring, humans have a major role in it — have been ratified by scientists around the world in published scientific papers, in statements issued by professional scientific societies, and in reports of the National Academy of Sciences, the British Royal Society and many other national and royal academies of science worldwide. Even the Bush administration accepts the fundamental findings. As President Bush's science advisor, John Marburger III, said last year in a speech: "The climate is changing; the Earth is warming."
The rest is at:
http://www.commondreams.org/views06/0724-28.htm