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Volume 3 Number 37:  27 December 2000

Temperature Record of the Week
This issue's Temperature Record of the Week is from Covington, Georgia. Visit our U.S. Climate Data section to plot and view these data for yourself.

Current Editorial
Programmed Plants: Ready for Future Challenges?: The discovery of a gene that shuts down certain normally-beneficial responses to atmospheric CO2 enrichment that could become detrimental to plants above a certain critical CO2 concentration suggests that plants are "well armed to cope with a further enrichment in atmospheric CO2."

Subject Index Summaries
Salinity Effects (Plants): Research demonstrates that significant levels of soil salinity do not preclude a positive plant growth response to atmospheric CO2 enrichment.

Wood Density: In addition to increasing the amount of wood produced by trees, atmospheric CO2 enrichment appears to increase the density of the wood, which also enhances its strength.

Current Journal Reviews
CO2 and Temperature: Who Leads the Dance of the Geophysical Parameters?: New data continue to confirm what we have long contended, namely, that it is changes in air temperature that drive changes in atmospheric CO2 concentration, and not vice versa.

More Evidence for the Little Ice Age in South America: A paleohydrologic study of Andean saline lakes yields evidence indicative of the fact that the Little Ice Age was much more than a local phenomenon of lands bordering the North Atlantic Ocean.

Effects of Elevated CO2 on Antioxidative Enzymes in Soybean: Elevated CO2 reduced the activities of several antioxidative enzymes in soybean leaves, indicating that growth in elevated CO2 reduces plant stresses that produce harmful reactive oxygen compounds.

Elevated CO2 Reduces Ozone Damage in Spring Wheat: Elevated CO2 increased photosynthetic rates while reducing stomatal conductance in field-grown spring wheat.  In addition, atmospheric CO2 enrichment ameliorated elevated O3-induced reductions in rubisco content and activity.

Effects of Elevated CO2 on a Native British Tree Species: Elevated CO2 increased photosynthetic rates, reduced stomatal conductance, but did not affect stomatal density in this native British tree species.  In addition, elevated CO2 significantly increased leaf area and lateral branch numbers.