Current Editorial
Cosmic Rays: Can They Influence Climate on Centennial and Millennial Time Scales?: This question is admirably addressed by three scientists who review what is known about the subject and outline fertile directions for future research.  We briefly describe their overview of the field, present our interpretation of pertinent data, and join them in their call for more research to address a number of important related topics.

Subject Index Summaries
Biodiversity (Weeds vs. Non-Weeds): Some people have suggested that future increases in the air's CO2 content will increase weed problems in agricultural environments.  However, after reviewing some of the recent relevant literature in this area, we conclude that a much different response is likely to occur.

Medieval Warm Period (Solar Influence): Are variations in solar activity responsible for the millennial-scale oscillation of earth's climate that produced the Medieval Warm Period?

Current Journal Reviews
Has the "Unprecedented Warming" of the Last Century Had Any Effect on West Antarctic Ice Sheet Dynamics?: Climate alarmists have been telling us for years that it has.  Climate skeptics have been telling us for years that it hasn't.  Now, at last, there are data to decide the debate.  And the winners are .........

Temperature Histories of Remote Mountain Lakes in Europe: What do they tell us about 20th century warming?

Effects of Elevated CO2 and Soil Nitrogen on Mechanical Properties of Spruce and Beech Wood: Atmospheric CO2 enrichment generally increases biomass production in woody plants.  However, little is known about the effects of CO2-enriched air on mechanical wood properties.  This review describes a study that investigates this subject in spruce and beech seedlings.

Effects of Differential Day/Night Elevated Air Temperatures on Net Photosynthesis in Cottonwood Trees: Climate models often predict greater increases in minimum nighttime air temperature than in maximum daytime air temperature, as is also observed in nature.  How does this greater warming of night compared to day affect net photosynthesis?

Effects of Elevated CO2 and Soil Moisture on a Chinese Variety of Spring Wheat: Plants sometimes exhibit different responses to atmospheric CO2 enrichment under different soil moisture conditions.  How will a Chinese spring wheat cultivar respond to elevated CO2 when water is limiting to its growth?