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> Also, if I had to guess, proxies that show global warming to be bad are widely publicised, whilst proxies that show global warming not to occur are ignored.

You are mixing categories. One is about the observable universe, ie. "does global warming happen"? The other one is a value judgement, ie. "is global warming bad?"

I mean, if you want to go down that route, why assume that the expansion of mercury in a glass tube is a good proxy for atmospheric temperature?

Sometimes it feels hotter or colder than the mercury would indicate, after all.

QED, it is impossible to determine if the climate is changing.

"I don't know if this sign about a cliff ahead was right, so I'm gonna keep going pedal to the metal. Just in case..."