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Volume 10 Number 21:  23 May 2007

Editorial
Arctic Warming: Is It as Real and as CO2-Induced as Climate Alarmists Claim?: Sweden's Wibjorn Karlen answered this two-part question a little over a year and a half ago. We here report his response - a little tardy on our part, but better late than never.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from the Chilean Continental Slope, Southern Chile.

Subject Index Summary
Range Expansion (Plants - North America: United States, Southwest): What do experimental and observational studies reveal about the nature of woody-plant range expansions in the southwestern United States?

Journal Reviews
Have Hurricane Intensities Increased as the World has Warmed?: A globally consistent reanalysis attempts to answer this important question.

The Urban Heat Islands of Beijing and Wuhan, China: Do the most recent analyses of their influence increase or decrease our faith in the accuracy of the globe's purported historical temperature increase?

The Photosynthetic Response of a Short-Rotation Poplar Plantation to Elevated CO2 after Six Years of Treatment: Over the course of the study, did the CO2-induced enhancement of leaf photosynthesis increase, decrease or stay about the same as it was at the start of the experiment?

The Competing Effects of Elevated O3 and CO2 in a Hybrid Poplar Clone: How do they compare?

Photosynthetic and Stomatal Conductance Responses of Plants to Atmospheric CO2 Enrichment: What do we learn from the most recent meta-analysis of FACE study results?