Editorial
Climate Model Problems: I. Temperature and Humidity: How well do state-of-the-art climate models describe the mean vertical profiles of temperature and water vapor throughout the troposphere? And why do we care?

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Lake Lehmilampi, Eastern Finland.

Subject Index Summary
Feedback Factors (Biophysical - Iodocompounds): How important can this single biophysical feedback factor be in counteracting global warming due to any phenomenon?

Journal Reviews
Does Global Warming Intensify Tropical Cyclones?: Some recent claims that the answer is "yes" are evaluated with data from the western North Pacific.

Holocene Floods and Climate of Northeastern Utah, USA: How are they related?

The Characteristic Thermal Response of C3 Plants to Variations in Atmospheric CO2 Concentration: How do CO2 concentrations typical of the late-Pleistocene, as well as those of our likely long-term future, impact C3 plants in terms of optimum temperatures for photosynthesis and maximum photosynthetic rates at those optimum temperatures?

Peanut Seed Yield and Quality as Influenced by Ozone and Carbon Dioxide: What are the relative strengths of the opposing negative effects of O3 and the positive effects of CO2?

Cryoturbation Effects on Soil Organic Matter in a Warming Arctic: Will they result in more or less soil carbon escaping to the atmosphere as CO2?