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Are you claiming that it is not possible to find a trend in a mean temperature of a great many points across the globe, over a long period of time?

What makes such a measurement an "invalid form"?

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It is not possible if there aren't valid temperature measurements available for all points throughout the measured period of time, so that many temperatures are "interpolated", estimated etc.

Except that we do have a massive number of recorded temperatures across a massive number of locations in the last 100 years. Climate models, some dating back to the 1970s, have correctly predicted global temperature changes in the 50 years since based on this data.

The measurements are real, and there is an established history of the models being generally correct (if not in specific details) by now. Climate study is not the new science you seem to think it is.

> Climate models, some dating back to the 1970s, have correctly predicted global temperature changes in the 50 years since based on this data.

Can you point me to one such model? One that actually predicted temperatures correctly back in the 1970s and not after various recent "adaptations" like "corrected" emission data?

> The measurements are real

Yes, measurements are real. Interpolations, resulting "global" temperatures and predictions aren't.

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