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One of Europe’s oldest temperature series goes back 300 years: Berlin-Dahlem.

Cyclic behavior. Source: Free University of Berlin/Wikipedia

Readers will note the mean temperatures were warmer than they are today. The 1990s and 2000s were similarly warm as they were in the mid 1700s.

Moreover, the long-term trend was downward from 1760 to 1990, despite atmospheric CO2 having risen since 1850.

Hat-tip: Klima.Wissen.