…but a clear rising trend since 1900.
So what made it warmer in the period between 1850 and 1900?
Was it warmer? How many weather stations existed in this grid box at that time? What was their standard of exposure and the quality of their equipment?
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Real Science 
…but a clear rising trend since 1900.
So what made it warmer in the period between 1850 and 1900?
Was it warmer? How many weather stations existed in this grid box at that time? What was their standard of exposure and the quality of their equipment?