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Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999



Item #d95mar7

Three items from Global Biogeochem. Cycles, 9(1), Mar. 1995:

"Limiting Future Atmospheric Carbon Dioxide," J.L. Sarmiento (Atmos. & Ocean Sci. Prog., Princeton Univ., POB CN710, Princeton NJ 08544), C. Le Quéré, S.W. Pacala, 121-137. Describes a contribution to the IPPC's model comparison study that estimates allowable emissions for stabilizing future atmospheric CO2 concentrations at levels ranging from 350 ppm to 750 ppm. Concludes that all stabilization scenarios require a substantial future reduction in emissions.

"Uncertainties in Future CO2 Projections," S.G. Craig (Dept. Meteor., Stockholm Univ., S-106 91 Stockholm, Swed.), J.J. Holmén, 139-152. Incorporates CO2 fertilization of the terrestrial biosphere and enhanced regrowth of previously felled temperate forests into a box diffusion model of the ocean-atmosphere system coupled to a five-box terrestrial biosphere. The CO2 record can accommodate a carbon budget balanced by CO2 fertilization, but balancing the carbon budget with forest regrowth is more difficult.

Comment on "'The Lifetime of Excess Atmospheric Carbon Dioxide,' by B. Moore III and B.H. Braswell," S.R. Gaffin (Environ. Defense Fund, New York, N.Y.), B.C. O'Neill, M. Oppenheimer, 167-169. An extensive comment concerning the modeling of future CO2 levels and the calculation of global warming potentials.

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