Editorial
The Carbon-Sequestering Status of Old-Growth Forests: Are they losing or gaining carbon? ... or are they carbon neutral?

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Pampa del Tamarugal Basin, Atacama Desert, Chile.

Subject Index Summary
Nitrogen (Progressive Limitation Hypothesis - Grasslands): What does it suggest? ... and what do most experiments suggest about it?

Journal Reviews
West Greenland Warming: 1991-2004: How dramatic was it? ... and how unprecedented?

Winter Droughts of the Upper Rhine River Basin: How have they varied over the past four and a half centuries?

Winter Floods of the Vistula River: How have they varied over the past millennium?

Engineering Crops to Better Cope With Global Warming: Is it imminent reality? ... or is it merely wishful thinking?

We Live in a Complex World ... and so do Grasshoppers: How does the combination of anthropogenic-induced changes in three environmental factors influence the growth of grasshoppers?