The Critics Say: ”Global Warming is just a hoax perpetrated by environmental extremists and liberals who want an excuse for more big government.”
This is a very common line and is usually couched in more colorful language (enviro-Nazis, liberal wack jobs, that kind of thing). While appeals to authority are not always the most convincing of scientific arguments, this non-scientific attack is best answered with just that, to wit:

Answer:

Here is a list of those so-called"enviromental extremists" who believe that Anthropogenic Global Warming is real and well supported by sound science:
Intergovernmental Panel on Climate Change (IPCC) – IPPC statements have been agreed on by over 2000 scientists and 100 governements! http://www.grida.no/climate/
National Oceanic and Atmospheric Administration (NOAA) http://www.ncdc.noaa.gov/
National Academy of Sciences (NAS) http://books.nap.edu/collections/global_warming/index.html
State of the Canadian Cryosphere (SOCC) http://www.socc.ca/permafrost/permafrost_future_e.cfm
Environmental Protection Agency (EPA) http://yosemite.epa.gov/
The Royal Society of the UK (RS) http://www.royalsoc.ac.uk/page. asp?id=3135
American Geophysical Union (AGU) http://www.ametsoc.org/policy/climatechangeresearch_2003.html
American Institute of Physics http://www.aip.org/gov/policy12.html
National Center for Atmospheric Research (NCAR) http://eo.ucar.edu/basics/cc_1. html
American Meteorological Society (AMS) http://www.ametsoc.org/policy/jointacademies.html

Additional to that list, see also this joint statement that specifically and unequivocally endorses the work and conclusions of the IPCC Third Assessment report, issued by:
- Academia Brasiliera de Ciências (Bazil)
- Royal Society of Canada
- Chinese Academy of Sciences
- Academié des Sciences (France)
- Deutsche Akademie der Naturforscher Leopoldina (Germany)
- Indian National Science Academy
- Accademia dei Lincei (Italy)
- Science Council of Japan
- Russian Academy of Sciences
- Royal Society (United Kingdom)
- National Academy of Sciences (United States of America)

http://nationalacademies.org/onpi/06072005.pdf

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and this one that includes the above signers plus:
- Australian Academy of Sciences
- Royal Flemish Academy of Belgium for Sciences and the Arts
- Caribbean Academy of Sciences
- Indonesian Academy of Sciences
- Royal Irish Academy
- Academy of Sciences Malaysia
- Academy Council of the Royal Society of New Zealand
- Royal Swedish Academy of Sciences
http://www.royalsociety.org/ displaypagedoc.asp?id=13619

But perhaps you would find the opinion of some of the bastions of industry more convincing than those of the pointy-headed intellectuals?

BP, the largest oil company in the UK and one of the largest in the world has this opinion:
“There is an increasing consensus that climate change is linked to the consumption of carbon based fuels and that action is required now to avoid further increases in carbon emissions as the global demand for energy increases.”

Shell Oil (yes, oil the fossil fuel) says:
“Shell shares the widespread concern that the emission of greenhouse gases from human activities is leading to changes in the global climate.”

Here is what 18 CEO's of Canada's largest corporations had to say in an open letter to the Prime Minister of Canada:
“Our organizations accept that a strong response is required to the strengthening evidence in the scientific assessments of the Intergovernmental Panel on Climate Change (IPCC). We accept the IPCC consensus that climate change raises the risk of severe consequences for human health and security and the environment. We note that Canada is particularly vulnerable to the impacts of climate change.”

Have the Enviro-Nazis finally seized the industrial reigns of power?

Somehow, I doubt it.

Seeing the severity of the problem and it's likely effects, maybe we should listen to thousands of scientists, hundreds of governments and industry rather than to a few 'head-in-the-sand' critics...

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