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suricat here's another potential empirical falsification to follow over the next few weeks. It's easy to understand and plausible.
Of course it is, this is an old trick. It's how The House of Commons won power over The House of Lords in the UK. The House of Commons just kept making Peers until the Commons sympathisers in The House of Lords held the majority. Average biasing is rooted in politics, following a General Election the first thing the new government does is alter the constituency boundaries to bias future elections in their favour (all under the presumption of greater stability).
I saw this earlier and pondered on the point of dividing the globe into pentagonal sectors (like a football), then grid each pentagon evenly. You would still be faced with grid biasing due to differing populations within the grid. It's a bit like trying to see a digital picture with only a random 40%, or less, of the clamped texels showing in the whole picture.
Do you remember me saying to Steve_M that "I wouldn't believe global ave temps unless we had a 'one kilometre' square grid" and his response "I wish"?

Even with the '+c offset' differences on the graph between satellites, I still think the satellites are more believable.
Best regards, suricat.