This time they all voted for Obama.

If the Ice Age led to extinction of specific lemming populations, one may expect that a warming climate would conversely support genetic diversification.

The lemmings probably went extinct when they all decided to direct their movements by consensus over the nearest cliff.

Consensus? I had no idea lemmings were scientific creatures!

Tadchem - they were eliminated by rapid climate change.

Counterpoint - Rainforests are warm and contain most of the world's diversity. They also have been the most stable climates found on Earth.