From Eric Kvaalen, Les Essarts-le-Roi, France
Fred Pearce writes that a new Arctic is being created – “perhaps the most profound change to the look of our planet for millions of years…” (8 April, p 33). But what about the Holocene thermal maximum 10,000 years ago, when Arctic temperatures were about 1.6°C warmer than now on average? Or the Eemian interglacial period 125,000 years ago, when there were forests where we have tundra, and hippos in the Thames?
