Editorial
Ocean Acidification: The "Evil Twin" of Global Warming: So reads the first subject heading of a paper recently published in Trends in Ecology and Evolution, which we feel compelled to examine a little closer.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from the Kattegat Region of North Sea.

Subject Index Summary
Ocean Acidification (Effects on Marine Plants: Phytoplankton -- Cyanobacteria): As the air's CO2 content continues to rise, how will the oceans' smallest photosynthesizing organisms respond to the enhanced "acidification" of the environment in which they live?

Journal Reviews
The Variation of Near-Surface Wind Speed with Altitude of Land: How has it changed over the past half-century? ... and what are the ramifications of the change?

Elevated CO2 Boosts Iron's Positive Impact on Phytoplanktonic Productivity: ... and it appears to do so by "acidifying" the ocean.

CO2- and Climate-Induced Effects on Terrestrial Plant Production: What does one of the most detailed mechanistic models project for the next ninety years?

A Seven-Decade History of the Water-Use Efficiency of a Swiss Alpine Grassland: How was it obtained? ... and what did it show?

The Long-Term Response of Plant Photosynthesis to Elevated CO2: Does it decline over time?