Can you offer evidence AGAINST man-made global warming?

I've noticed a large amount of what-may-be-called 'deniers' prowling around the 'Global Warming' section. I became a bit interested when one user "A Modest Proposal" posted several links in replies to a question which was constructed more like a rant, and ended up getting 4... show more I've noticed a large amount of what-may-be-called 'deniers' prowling around the 'Global Warming' section. I became a bit interested when one user "A Modest Proposal" posted several links in replies to a question which was constructed more like a rant, and ended up getting 4 'tumbs-down' indicating that these people haven't actually read any of the sources, be they deniers or not.

So I'm giving you to opportunity to present an argument against man-made global warming. I hope "A Modest Proposal" doesn't mind, but I'll quote their answer here so that it'll be easier to find counter-arguments.

In all likelihood, this post will be flooded by people who don't have much else to say other than finger-pointing and calling the experienced scientists who've spent years testing this out "liars". But I'm hoping that at least one person will present a GOOD ARGUMENT with RELIABLE SOURCES. In case these people don't man-up enough to actually fight the evidence for man-made global warming, I wouldn't mind if supporters actually weighed up the arguments for and against (without bias).

I know the futility of asking this question and expecting any reasonable answers, but I thought I'd try nevertheless.

"A MODEST PROPOSAL"'S QUOTE: (note: I have had to remove certain sections to comply with the 10-link rule for question-posting)

Current CO2 levels:
http://www.esrl.noaa.gov/gmd/ccgg/trends

Isotopic evidence that recent CO2 levels are due to man-made emissions
http://www.realclimate.org/index.php/arc...
http://environmentalchemistry.com/yogi/e...
http://www.aip.org/history/climate/Radioc.htm
http://www.radix.net/~bobg/faqs/scq.CO2rise.html
Human Emissions vs. Volcanic Emissions (humans win by two full orders of magnitude)
http://volcanoes.usgs.gov/hazards/gas/climate.php
Stratospheric cooling and tropospheric warming - this is due to thermal insulation by greenhouse gases. Thermal radiation form the Earth is trapped within the lower atmosphere due to the enhanced greenhouse effect.<br>
http://www.remss.com/msu/msu_data_description.html
http://earthobservatory.nasa.gov/Newsroom/view.php?id=25719
http://data.giss.nasa.gov/gistemp/
http://www.atmosphere.mpg.de/enid/20c.html

Thanks.
12 answers 12