We have good proxies going back 1500-2000 years. Ice cores going back 800,000 years. This rate of warming seems unprecedented...
Civilisation developed and prospered in the Holocene, a time of relatively stable climate. On that timescale, the current and projected rate of modern warming is practically vertical.
Civilisation developed and prospered in the Holocene, a time of relatively stable climate. On that timescale, the current and projected rate of modern warming is practically vertical.

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