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Technically when the Earth still had a molten crust it was the hottest. Does that matter right now? No, this is about our climate changing radically and us needing to do something before we make our planet less habitable. Nitpicking at phrasing will not help with this.

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The UK was a serious wine and grape producer in the Middle Ages. It was warmer. We’re not even at that stage yet.

There's no evidence for this. England was slightly warmer in the Medieval period than in the Renaissance or Iron Age, but nowhere near as warm as today. There were more vineyards in the 11th century than the 19th century, but at this point there are vineyards all over England, and there are even a few in Scotland.

In short, although vineyards are an extremely bad proxy for the temperature record, even by the vineyard standard it is much warmer today in the UK than it ever was over recorded history.

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