Editorial
The Impact of Predicted Future Warming on Perennial Crop Yields in California, USA: The calculated negative impact will likely be totally overpowered by the positive impact of the concomitant increase in the air's CO2 concentration.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from the Northeastern Arabian Sea.

Subject Index Summary
Precipitation (Variability - North America): Has North America experienced more extreme wet and dry periods in response to the warming of the past hundred or more years?

Journal Reviews
Global Cloud Cover Over Land: 1971-1996: How has it changed? And what do the changes suggest about earth's climate?

Urban CO2 Concentrations and Fluxes in Suburbs of Melbourne, Australia: How do they compare with what has been observed in other major cities of the world?

CO2 Effects on Cork Oak Seedlings Exposed to High Light and Water Stress: Do elevated atmospheric CO2 concentrations help any?

Deaths Due to Heat: The Shanghai Experience: Must mortality rates necessarily rise in response to rising temperatures?

Atmospheric CO2 Enrichment of Tree Seedlings in Deep and Moderate Shade: Under which condition is it more effective? And why do we care?