Harijan wrote:3. No - there is not a consensus in the scientific community on what is causing global warming. Opinions among climatologist include, but not limited to, (in no particular order):
a. Greenhouse effect
b. Higher energy outputs from the sun
c. The natural pattern of global temperature change
You come across as a very intelligent individual, Harijan, but this bothers me. Either you don't understand what scientific consensus means, or you've been mislead. I am rather confident it is the latter, as it has happened to me in the past. Let me give some perspectives of the scientific consensus.
From Science, 2004:
The American Meteorological Society (6), the American Geophysical Union (7), and the American Association for the Advancement of Science (AAAS) all have issued statements in recent years concluding that the evidence for human modification of climate is compelling (8).
The drafting of such reports and statements involves many opportunities for comment, criticism, and revision, and it is not likely that they would diverge greatly from the opinions of the societies' members. Nevertheless, they might downplay legitimate dissenting opinions. That hypothesis was tested by analyzing 928 abstracts, published in refereed scientific journals between 1993 and 2003, and listed in the ISI database with the keywords "climate change" (9).
The 928 papers were divided into six categories: explicit endorsement of the consensus position, evaluation of impacts, mitigation proposals, methods, paleoclimate analysis, and rejection of the consensus position. Of all the papers, 75% fell into the first three categories, either explicitly or implicitly accepting the consensus view; 25% dealt with methods or paleoclimate, taking no position on current anthropogenic climate change. Remarkably, none of the papers disagreed with the consensus position.
Admittedly, authors evaluating impacts, developing methods, or studying paleoclimatic change might believe that current climate change is natural. However, none of these papers argued that point.
This analysis shows that scientists publishing in the peer-reviewed literature agree with IPCC, the National Academy of Sciences, and the public statements of their professional societies. Politicians, economists, journalists, and others may have the impression of confusion, disagreement, or discord among climate scientists, but that impression is incorrect.
The scientific consensus might, of course, be wrong. If the history of science teaches anything, it is humility, and no one can be faulted for failing to act on what is not known. But our grandchildren will surely blame us if they find that we understood the reality of anthropogenic climate change and failed to do anything about it.
Many details about climate interactions are not well understood, and there are ample grounds for continued research to provide a better basis for understanding climate dynamics. The question of what to do about climate change is also still open. But there is a scientific consensus on the reality of anthropogenic climate change. Climate scientists have repeatedly tried to make this clear. It is time for the rest of us to listen.
http://www.sciencemag.org/cgi/content/f ... /5702/1686
Additionally, the majority of all the prestigious scientific communities and organizations (NAS, etc) have issued supporting statements on the issue. This is not to be taken lightly. I know it's wiki, but here's a list...
http://en.wikipedia.org/wiki/Scientific ... ate_change
Sure there is dissent, it wouldn't be science if there wasn't. But the number of contrarians is dwarfed by the number of supporters. That is scientific consensus. Also, I believe that there is usually mention of suppression at this point... I offer this to preempt that...
http://environment.newscientist.com/cha ... hange.html
In conclusion, please consider these as evidence for a scientific consensus on anthropogenic climate change. You by no means have to agree with it, and this, of course, does not mean the consensus view is right, but you are putting yourself in an unpleasant place when you say there isn't. Also, I suggest you read The Republican War on Science by Chris Mooney (if you can use Crighton, I can use Mooney). He provides an excellent recap of current trends in scientific opinion during his contrast of Republican science abuses.