Editorial
Climate Model Problems: III. Deserts: Whereas climate models based solely on physical and chemical phenomena predict that earth's deserts will expand as the air's CO2 content rises, it is found that including the effects of two biological phenomena reverses the predicted trend and suggests that the total area of earth's deserts will actually decline as CO2 accumulates in the atmosphere.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Spannagel Cave, Central Alps, Austria.

Subject Index Summary
Feedback Factors (Diffuse Light): We describe a chain of events that begins with an increase in the air's CO2 content and ends with a tendency for global cooling, plus some of the evidence for the reality of the phenomenon.

Journal Reviews
Five Hundred Years of Baltic-Sea Water and Air Temperatures: What do they reveal about the nature of 20th-century warming?

The Roman and Medieval Warm Periods in the Southern Austrian Alps: How did the maximum warmth of the two periods compare with that of today?

Herbivores and Their Host Plants in a Warmer World: How will the two match up?

A Rapid Start to the CO2-Induced Enhancement of Nitrogen Fixation in Garden Beans: Just how soon after seed germination is the process initiated?

Dandelion Reproduction in CO2-Enriched Air: Is it enhanced or retarded compared to reproduction in ambient air?