Editorial
Tree-Based Climate Reconstructions in CO2-Accreting Air: How good are they when they don't account for physiological effects of the historical increase in the atmosphere's CO2 concentration?

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Finland's Southern Boreal Forest, near Savonlinna, Finland.

Subject Index Summary
Arctic Temperature Variability (Last Several Interglacials): How do Arctic temperatures of the current interglacial period compare with those of prior interglacials?

Journal Reviews
Sea Level at Port Arthur, Tasmania: How much did it rise between 1841 and 2002?

An Environmental History of Yellowstone National Park: How does the Park's climate of the past 150 years compare with that of the prior two and a half millennia?

Birds and Climate: How well do the presumed relationships between the two reflect reality?

Cold-Related Mortality in Europe: What is its deadliest defining characteristic?

Salinity Stress in Barley: How is it impacted by rising atmospheric CO2 concentrations?