Editorial
Is the Growth of Phytoplankton Limited by the Current Low Concentration of Atmospheric CO2?: The question has historically been difficult to answer.  Recent experiments, however, suggest an affirmative response that has important real-world ramifications.

Subject Index Summaries
Urban CO2 Dome (Phoenix, Arizona, USA): What is the Urban CO2 Dome?  What causes it?  What modifies it?  What effects does it have on urban climate and biology?  Your questions answered here, based on data from the city where the concept was first elucidated.

Acclimation (Chaparral and Desert Species): Although it often occurs in chaparral and desert plants, acclimation of photosynthesis is typically accompanied by sizeable reductions in stomatal conductance that enhance water use efficiency and enable plants to perform better, and longer, under droughty conditions.

Journal Reviews
The Climatic Consequence of a Freshening of the North Atlantic Ocean: In the event of a freshening of the North Atlantic Ocean similar to what is sometimes predicted to occur in response to CO2-induced global warming, would we likely see (a) another major ice age, (b) another Little Ice Age, (c) no change in climate or (d) a warming of high northern latitudes?

Spurious Warming Signal Detected in USHCN Temperatures: They are some of the most respected temperature data in the world, but they still have their problems.

Reconstructed Warm-Season Temperatures of Nome, Alaska: As ever more long-term temperature histories become available, it is becoming ever more clear that no significant part of the 20th century was warmer than any comparable period of the preceding one to two millennia, in striking contrast to the unremitting claims of climate alarmists.

Plant Heat Tolerance: Adapting to Warmer Temperatures: Is it possible for plants to adjust their physiology to cope with global warming and survive the higher temperatures predicted for the future?

Isoprene Emissions from Hybrid Poplars Exposed to Elevated Concentrations of Atmospheric CO2: What do they portend about future tropospheric ozone pollution and methane-induced global warming?