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I don't know that anyone will ever agree on what pre-industrial means exactly, which gives a lot of room for inept leaders to wriggle out of their obligations. That's why I'm suggesting the IPCC and its member countries set and agree on targets where the meaning is clear, tangible, more precise, and to which people can relate more readily.
My idea is to change the simple message of 1.5 C or 2 C above pre-industrial to 1 C or 1.5 C above the 1951-1980 mean.