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Volume 12 Number 48:  2 December 2009

Editorial
Earth's Thermal Sensitivity to a Doubling of Atmospheric CO2: What is its true value?

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Makassar Strait, Sulawesi Margin, Indo-Pacific Warm Pool.

Subject Index Summary
ENSO (Relationship to Extreme Weather): Does the earth experience more extreme weather during El Niņo or La Niņa years?

Journal Reviews
Anthropogenic CO2 Absorption by the World's Oceans: How great is the rate at which it occurs? ... and how might that rate be changing?

Earth's Land Surface: Source or Sink of Anthropogenic CO2?: Over the course of the Industrial Revolution, earth's land surface has changed from a carbon source to a carbon sink. Why?

The Airborne Fraction of Anthropogenic CO2 Emissions: Is it gradually increasing as the world's land and oceans find it harder and harder to soak up ever greater quantities of the nefarious greenhouse gas?

Another Take on the Airborne Fraction of Anthropogenic CO2: Does it support other contemporary work on the subject? ... or does it differ from it?

Genetic Variability of Heat Tolerance in Cotton: Is there sufficient variability to enable breeding to accommodate projected increases in air temperature?