Editorial
Biological Effects of "Ocean Acidification": Are they as bad as climate alarmists make them out to be?

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Crevice Lake, Yellowstone National Park, USA.

Subject Index Summary
Permafrost (Degradation): Has it accelerated in response to late 20th-century global warming?

Journal Reviews
The Past Half-Century of ENSO Behavior: Has it become more extreme? ... and what's the significance of the answer?

ENSO Activity and Climate Change: How does the latter affect the former?

ENSO Prediction by Coupled Ocean-Atmosphere Models: How good is it?

Effects of Elevated CO2 and Temperature on Flowering Times of Asteraceae Species: What are the effects? ... and what are the implications of the results for prior interpretations of historical plant phenology observations?

The Growth of Scots Pines in Northeast Spain: How did they do during the "unprecedented" warming of the 20th century?