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Volume 12 Number 17:  29 April 2009

Editorial
CO2: The Utterly Amazing Air and Water Pollutant: In honor of the U.S. Environmental Protection Agency's recent decision to classify carbon dioxide as a pollutant, we direct you to our editorial of 1 November 1998. As a famous ball player once said: It's déją vu all over again!

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Lake Stora Višarvatn, Northeast Iceland.

Subject Index Summary
Arctic Temperatures (Variability - Late Holocene): How do prior temperatures experienced in earth's high northern latitudes during the latter portion of the current interglacial compare with those of the late 20th century?

Journal Reviews
The West Antarctic Ice Sheet: Is It About to Self-Destruct?: A new study of the West Antarctic Ice Sheet's behavior during the early Pliocene of five to three million years ago sheds new light on its future stability.

The West Antarctic Ice Sheet: How Fast Could It Collapse?: A new model of West Antarctic Ice Sheet behavior, created in conjunction with newly acquired empirical evidence, suggests it will not be disappearing any time soon.

Eleven Years of CO2 Enrichment of a Scrub Oak Ecosystem: What were the results? ... and how did they evolve over time?

Surface Greenhouse Gas Balance: Woodlands vs. Pastures: Which type of land surface helps most to slow global warming? ... and why?

Forest Litter Production and Soil Carbon Sequestration: How does the former promote the latter? ... and how is the process affected by atmospheric CO2 enrichment?