Pliocene like climates by 2040 is easy for me to swallow, after all the climates then seem similar to modern climates just warmer. Eocene like climates by 2050 is a bit harder to swallow. It's hard to imagine there being a tropical environment in the Arctic that can support alligators and Tortoises in about 30 years time.

Going from Pliocene to Eocene climates in as little as 10 years time makes me think the model either assumed a huge increase in greenhouse gas production with India and China becoming superpowers or assumed a runaway greenhouse effect.