Here’s a blast from the past. This particular site was used zillions of times on Usenet whenever global warming was "discussed".
I use the "scare quotes" because to describe what goes on on Usenet as "discussion" is like describing global thermonuclear war as "a mild case of suntan"
Anywho, here’s the graph of temperature and carbon dioxide for the last 1000 years as seen from this link:
The text next to this graph is revealing as to why the Hockey Stick is used exclusively when discussing "greenhouse warming":
By overlying the reconstructed temperature record of the past millennium with atmospheric CO2 from the Law Dome Ice Core the relationship between the two is apparent. More sophisticated analyses, such as that by Crowley et al, shows much of the temperature record can be explained by changes in solar activity, volcanic activity, and greenhouse gases (although the recent warming cannot be explained without taking into account changes in greenhouse gases). A similar analysis, with similar conclusions, is provided by Mann et al. The gradual downward trend that has been observed over the past 1000 years may also have a human component – recent research from the Livermore National Laboratory suggests that deforestation may have reduced the amount of the sun’s warmth absorbed at ground level.
Of course, if Crowley had managed to keep his data somewhere safe (like in a tin box under his bed) we might be able to check that "sophisticated analysis" for ourselves, wouldn’t we?