Good comment:
'When the IPCC says that we must limit “warming” to 1.5°C they’re being deceptive because, contrary to the common English usage of the word “warming,” what they call 1.5 °C of “warming” does not actually mean “getting 1.5 °C warmer.” It means only, very roughly, 0.3 to 0.5°C of actual warming, since the baseline temperature which they use is a guesstimate of average “preindustrial” (late Little Ice Age) temperatures, instead of the current climate optimum.
They do that because if they used a normal English definition of “warming” (i.e., “getting warmer”) they’d have to say that they think more than “0.5°C of warming” (or even less) would be catastrophic, and anyone with any sense would probably laugh out loud.
Of course, since, as you ably demonstrate, we don’t actually know what preindustrial temperatures were, using that as the baseline means that their target is ill-defined. But that’s okay, they’re happy to sacrifice precision for the sake of propaganda, because the real purpose is just to support parasitic climate industries'
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The Curious Case of the Missing Data...[more]