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The famous Bell Telephone Hour clip, with the all knowing Dr Frank Baxter explaining a very modern understanding of climate science in 1958.
Enlightening and infuriating.
Show this to your ditto head buddy who thinks global warming was invented by Al Gore.

Many people have seen this on other sites, but I thought it would be good to make it part of the Climate Crocks playlist.

More climate history here:
http://www.aip.org/history/climate/co2.htm

Gilbert Plass 1955 "Carbon Dioxide Theory of Climate Change"
http://wiki.nsdl.org/index.php/PALE:ClassicArticles/GlobalWarming/Article7
http://onramp.nsdl.org/eserv/onramp:16572/n7._Plass__1956corrected.pdf

Wally Broeker: Coins the term Global Warming in 1975
http://en.wikipedia.org/wiki/Wallace_Smith_Broecker
http://www.realclimate.org/index.php/archives/2010/07/happy-35th-birthda...
(click on link for original doc at google docs)

James Hansen's 1981 paper in Science
http://climateprogress.org/2008/08/27/right-for-27-years-1981-hansen-stu...
http://www.skepticalscience.com/Hansen-hit-a-home-run.html
http://pubs.giss.nasa.gov/docs/1981/1981_Hansen_etal.pdf