The climate became warm and humid worldwide towards the Eocene boundary, with subtropical vegetation growing in Greenland and Patagonia, crocodilians swimming off the coast of Greenland, and early primates evolving in the tropical palm forests of northern Wyoming.
O clima en todo o mundo fíxose cálido e húmido cara ao límite co Eoceno, con vexetación subtropical medrando en Groenlandia e Patagonia, con crocodilos vivindo fronte ás costas de Groenlandia, e primitivos primates nos bosques tropicais de palmeiras do norte de Wyoming.