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Volume 10 Number 51:  19 December 2007

Editorial
The Biological Atmosphere: Too Long Ignored by the IPCC?: A large fraction of the atmosphere's aerosol burden is composed of particles that either once were or still are alive.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Naychhudwari Bog, Himachal Pradesh, India.

Subject Index Summary
Evolution (Terrestrial Plants - Agricultural Crops): We normally think of evolution as acting very slowly over long spans of time. Is there anything we can do to "speed up the process" for the crops that support our species in ways that will enable them to become more productive in response to earth's changing environment?

Journal Reviews
Antarctic Temperatures: 1958-2002: How did the mean annual surface air temperature of the Southern Hemisphere between latitudes 60 and 90S, which includes the entire continent of Antarctica and much of the surrounding Southern Ocean, vary over the 45-year period?

The Climatic Consequences of Permafrost Degradation in Boreal Peatlands: Will the phenomenon exacerbate or mitigate greenhouse-gas-induced global warming?

100-Plus Years of Thunderstorms in Poland: How have they responded to the "unprecedented" warming of the 20th century?

Amazon Forest Response to the Drought of 2005: How much "browning" did the region experience?

Does Atmospheric CO2 Enrichment Enhance the Negative Effects of Invasive Plants on Native Plant Assemblages?: What one recent studied revealed about the important question.