Skimming the paper, it looks like they predict pliocene/eocene climates primarily for equatorial zones, with polar and high-latitude regions less effected. Eoc

Skimming the paper, it looks like they predict pliocene/eocene climates primarily for equatorial zones, with polar and high-latitude regions less effected. Eocene climates were also more even, with less of a difference between polar and equatorial temperatures. So alligators in the arctic is not strictly being predicted (at least not on that timescale, and that's not to say the predictions aren't scary in plenty of other ways.)