Editorial
The Debt We Owe to Atmospheric CO2 Enrichment: Without the increase in plant water use efficiency it provided the "founder crops" of early agriculture, none of us would likely be here today.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Paradise Lake, Tawang District, Arunachal Pradesh, India.

Subject Index Summary
Floods (Asia): What do studies conducted in Asia reveal about the likelihood of global warming producing more frequent and severe floods?

Journal Reviews
Tropical Cyclones of the Western North Pacific: What does the past four decades of observing them suggest about how their intensities would likely respond to future global warming?

A Millennium of Environmental Change in the Baltic Sea: How did climate and oceanic productivity vary throughout the record?

An Extreme Urban Surrogate of Projected Global Warming: How does vegetation typical of the Sonoran Desert perform in the even hotter, but CO2-enriched, environment of Phoenix, Arizona?

Carbon Sequestration in Ecosystems Across China: Is it currently increasing or decreasing? And what are the prospects for the future?

Genotypic Differences in Floral Initiation Response to Atmospheric CO2 Enrichment in Thale Cress Plants: What are they? And to what degree are they impacted by an 84% increase in CO2?