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The Paleocene-Eocene Thermal Maximum (or "PETM") was quite a roller-coaster. At its start, average global temperatures increased by approximately 6 °C within about 20,000 years. Slow compared to what we're doing now, but fast by geological standards! It lasted 200,000 years.
Very interesting. (Note: I goofed in my original calculation, losing a factor 10^3. So needs a lot more land!)
