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I just can't let this go. I fed the US Mean Temperature into a spreadsheet, and then plotted it.
The data only goes back to 1880, but the graph does suggest that the mean temperature peaked around 1954 and then crashed. It looks like we are approaching another peak.
But, I do see 2 cycles in this graph. The peak and valley of the 50's and 60's would tend to refute the claim that temperature trends were rising consistently throughout the 20th century.
P.S. The spreadsheet is attached. The data is in reverse chronological order.
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