Chart  Three takes us from 10 million to 100 million years ago - a giant step, for this window takes us from near the threshold of mankind back to the times when the dinosaurs dominated the world.  In going back through the time shown in this window, global climate changes from the cooler and dryer conditions which typify the late Cænozoic to the nearly-uniform warm & humid conditions typical of most of the Palæozoic and Mesozoic.