50 million year old palm leaf, from WY, photo at Denver Museum of Natural History. Related: 2008 article by Zachos, on "An early Cenozoic perspective on greenhouse warming and carbon-cycle" at: http://www.es.ucsc.edu/%7Ejzachos/Publications.html
CO2: Mauna Loa, Hawaii - downloaded from NOAA website, link to data: http://www.esrl.noaa.gov/gmd/ccgg/trends/
ENSO and Global Temperature
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