Quote:
Originally Posted by vivaldirules
A hint of that momentary peak in the data from one continent can also be seen in the global data, although it is much smaller there. The data that is displayed in the graphs at the link that Harry posted covers a longer period of time (and there is data from less direct measurements that go back very much further) and is of the global mean temperature. And the general trend upwards (with momentary variations) is clearly visible.
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The graph form the source Harry provided cannot be relied upon. It still incorporates invalid temperature data from the US. The temperature trend attributed to the northern hemisphere should have a peak that is much lower.
Also, before citing it as a source you should verify that the temperature from the 1800s is based on actual measurements, and not on a computer extrapolation. Furthermore, I wonder how many data points were actually recorded for each year, and where they were on the globe.
The difference with the US data is that I'm slightly more confident that the US had a sufficiency of data points each year, as well as a system to catch recording errors.