Editorial
The Gospel According to Sir John ...: Houghton, that is.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from the European Alps, Switzerland.

Subject Index Summary
Isoprene: How is the atmosphere's isoprene concentration impacted by the ongoing rise in the air's CO2 content? ... and why do we care?

Journal Reviews
Status of the East Antarctic Ice Sheet: How has its volume varied over the course of the Holocene?

Yellowstone National Park (USA): Precipitation Since AD 1173: How does the record compare with that of the "anomalously warm" 20th century?

Demise of the Maya in Belize: When and why did it occur?

Trees and Their Roots in a Changing World: How are they faring in response to concurrent global warming and atmospheric CO2 enrichment?

Initial Effects of Atmospheric CO2 Enrichment on Nitrogen Fixation in Legumes: What does a recent study of the common garden bean reveal about the subject?