Comment Re:How far back do the records exist? (Score 1) 30
Except:
A) we are talking about sea temps 10m below the surface across a global data set. Some Enlightenment polymaths taking readings with their home made thermometers in Europe wouldn't impact that data set at all.
B) "guestimates" would be hilarious to include in a conclusion being reached based on HUNDREDTHS of a degree (0.10 vs 0.09)
My supposition would be this is modem data only, eg since the 1990s MAYBE.