Ceaseless change dominates our dynamic planet

Nothing about Earth history is static or unchanging. That’s particularly true of climate, and thereon hangs more than one interesting tale including recent news of a scientific advance in understanding how past climate has changed.

It wasn’t too long ago by my standards – about the 1830s – that naturalists started to seriously think the globe has undergone revolutions in climate. The evidence for that came from Europe, where glacially polished and transported rocks dot the landscape. By going high up into the Alps, men like Louis Agassiz studied glaciers, how they slowly flow downhill, and how...