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Carbon Sequestration Commentary: Volume 6

Trees in the City: A New Role for the Ultimate Urban Multitaskers
Compared to their country cousins, urban trees comprise but a small portion of the planet's global forest. What they lack in numbers, however, they make up in special services and enhanced robustness, which virtues make them real "pros" at slowing the rate of rise of the air's CO2 content.

Urban Trees: Their Long List of Virtues
Carbon-sequestering trees that are strategically planted to (1) reduce building heat loads in summer by providing shade or (2) reduce building cooling rates in winter by providing protection from wind - and which thereby further reduce the rate of rise of the air's CO2 content - have a host of additional virtues that recommend their introduction into urban environments, even if one does not believe in reducing atmospheric CO2 concentrations as a means of combating global warming.

Lowly Lichens and Algae Help Arid Lands Sequester More Carbon as the Air's CO2 Content Rises
The earth possesses a vast array of mechanisms for tempering tendencies for climate changes that could be detrimental to the biosphere. We here explore another one that could so easily be overlooked.

CO2-Enhanced Carbon Sequestration in Africa and Asia Helps the Rest of the World As Well ... and in More Ways Than One
Can you guess what they are? The answers may surprise you.

Carbon Sequestration in Agricultural Soils: A Comprehensive Review of Free-Air CO2 Enrichment Studies
As the air's CO2 content rises, it is our contention that progressively more organic matter will be stored in the ground beneath each unit area of the vegetated portion of the planet, due to the enhanced plant growth provided by the aerial fertilization effect of atmospheric CO2 enrichment. We here report the results of a major review of this subject that looks at free-air CO2 enrichment studies of agricultural soils.

Hurricanes and Oceanic Carbon Sequestration: Another Negative Feedback Process to Slow Global Warming
Rising temperatures may reduce hurricane frequency and intensity, thereby lowering the sea-to-air flux of CO2 and reducing the rate at which CO2 accumulates in the atmosphere.

Demise of Earth's Tropical Forest Carbon Sink Greatly Exaggerated
In a recent paper in Nature, Phillips et al. (2002) suggest that increases in the air's CO2 content are stimulating the growth of vines in Amazonian forests. We can accept that. However, we cannot accept their claim that this phenomenon is detrimental to trees and, therefore, that "the tropical terrestrial carbon sink may shut down sooner than current models suggest."