February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 7, NUMBER 5, MAY 1994
PROFESSIONAL PUBLICATIONS... OF GENERAL INTEREST: POPULATION GROWTH AND RISING
of Continental-Scale Metro-Agro-Plexes, Regional Ozone Pollution,
and World Food Production," W.L. Chameides (Sch. Geophys.
Sci., Georgia Inst. Technol., Atlanta GA 30332), P.S. Kasibhatla
et al., Science, 264(5155), 74-77, Apr. 1, 1994.
The three metro-agro-plexes of the northern mid-latitudes
account for most of the world's commercial energy consumption,
fertilizer use, food-crop production and food export, as well as
for nitrogen oxide emissions that lead to ground-level ozone
pollution. Simulations using a global chemical transport model
show that exposure of crops to yield-reducing ozone pollution may
triple by 2025 if rising anthropogenic NOx emissions are not
2020: Consequences of Population Growth and Development on
Deposition of Oxidized Nitrogen," J.N. Galloway (Dept.
Environ. Sci., Univ. Virginia, Charlottesville VA 22903), H. Levy
II, P.S. Kasibhatla, Ambio, 23(2), 120-123, Mar.
Calculations using a global chemical model project a 25%
increase in total nitrogen deposition by the year 2020 in
highly-developed countries, and at least a doubling of reactive
nitrogen deposition in less-developed regions. Aside from
acidification effects, increased deposition has the potential to
fertilize both terrestrial and marine ecosystems, resulting in
the sequestering of carbon. It will also increase emissions of
nitrous oxide and decrease methane consumption in forest soils.
Atmospheric levels of nitrogen oxides will increase over much of
the globe, leading to higher ozone concentrations near the
Earth's surface and subsequent increases in the oxidative
capacity of the remote atmosphere and in its ability to absorb
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