Here’s a graph showing the extent of arctic sea ice as measured directly and indirectly for the last several hundred years:

Arctic Sea Ice Melting

Solid red line is the reconstructed 40 year smoothed, late-summer Arctic sea ice extent from Kinnard et al. (2011). Shaded area shows 95% confidence interval. Blue dashed line shows modern observations.

This graphic is from Skeptical Science, where you can also download a higher res version and learn more about the background for these data. Also, on that page is a link to a large number of useful graphics related to climate change.
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Comments

  1. #2 Deron
    February 4, 2013

    Global warming is a lie because I hate Al Gore!
    Global warming is a lie because scientists are stupid!
    Global warming is a lie because my car needs gas!
    Global warming is a lie because Lush Rimballs says so!
    Global warming is a lie because it goes against my politics!
    Global warming is a lie because even if it is true, who doesn’t like warm weather!
    Global warming is a lie because it was cold in Winnipeg last winter!
    Global warming is a lie because only Lord Jeebus can change the weather!

    Answer that, you smarty pants libs!

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