Far too many airports have turned from a mowed grass field with some lines on it in 1920 to a couple square mile of concrete and asphalt in 2020 to rely on the temperature data from the airport over that hundred years.
“0.3 Have there been any local environmental changes in the region where the temperature is measured.”
Except that 0.3 would come to play only if they failed to answer Question 0.2 “how is global average temperature *directly* measured”. If it’s not directly measured, it is no longer a “fact”, but an inference and an extrapolation, with lots of unknowns and uncertainties and inaccuracies and potentials for error. They need to account for all of them.
That level of uncertainty is certainly not the sort of thing that you want to stake your civilization on. Global warming cultists insist that they’re presenting “facts” when in fact all they are presenting are unproven conclusions or simple dogmas.