[The Shootist]

"Within about 10,000 years of peak warming, mammals such as primates and the groups that include horses and deer appeared together for the first time in North America, apparently having crossed land bridges from other continents."

Let me get this straight. The climate warmed. The ice caps melted. The sea levels rose. But LAND BRIDGES appeared between continents? How's that again?

[Junior]

Believe it or not, heavy glaciation and the resultant drop in sea levels is associated with global warming.