Past Climates: Tree Thermometers, Commodities, and People

Leona Marshall Libby was a pioneer in modern climatic research, a field that gained great impetus in the late twentieth century because of the promise it holds for predicting future climatic trends. Libby’s work led to remarkable new procedures for investigating long-term changes in precipitation and temperature and thereby greatly expanding our knowledge of past climates.

As Professor Rainer Berger writes in his foreword:

“In recent years, tree ring–based temperature data have been collec...