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"One can read reports such as listed at following site, to see where it can be shown that during the past 6000 years or so, there is evidence that it was warmer during the first half of the Holocene Climatic where surely mankind had little or no effect in increasing CO2 levels. http://www.co2science.org/scripts/Template/MainPage.jsp?Page=BrowseCatalogEnlarged&sProductCode=v8n37c2"

Of course co2science.org is going to disseminate propaganda claiming that there is nothing out of the ordinary going on...their on the take from Exxon-Mobil:
http://www.cspinet.org/integrity/nonprofits/center_for_the_study_of_carbon_dioxide_and_global_change.html
...and they collaborate with The George Marshall Institute who is also receiving giant checks from Big Oil:
http://www.exxonsecrets.org/html/orgfactsheet.php?id=36

Any information provided by scientific foundations (whether it be from for-profit or non-profit orgs) needs to be taken with a wheel barrow full of salt if they are receiving money from industries who could care less about the environment. So if you're going to post links to examples that are furthering your point, at least do it from sites where money lines can't be traced.