
Cold period: Mt. Rigi on the extreme left, Mt. Pilatus on the extreme right. A wild river transports gravel. The alpine glaciers are on the advance again, they 've already reached the city of Lucerne. Mt.Pilatus also sports some small glaciers.

Warm period: The galciers have retreated deep into to inner Alps, the flat lands are covered with lush forests of large trees and undergrowth. Why the absence of animals (and humans) in the picture? This version was commissioned by Prof. Benjamin Stocker, ETH. His focus lies on vegetation and climate science.
