The most accurate measurement...the one least influenced by heat islands, methods of measurement, huge data gaps in desolate areas and oceans...
Satellite Data.
Which has existing for a whopping 35 years.
So urban development causes (surface) global temperature risie? Better have more folKS move to small towns in the country and abandon all the leftist, urbantopia ideas that leninists use to herd people into government run control zones. The Regime will not be happy about this.