What was climate like in the past? - Reference list

    What was climate like in the past? – Reference list

    1) Wikipedia, Proxy (climate), http://en.wikipedia.org/wiki/Proxy_(climate)

    2) National Academy of Sciences, Evidence, Impacts, and Choices Figure Gallery, Figure 14, 800,000 Years of Temperature and Carbon Dioxide Records, http://nas-sites.org/americasclimatechoices/more-resources-on-climate-change/climate-change-lines-of-evidence-booklet/evidence-impacts-and-choices-figure-gallery/

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