A 40 percent depletion In the earth’s protective ozone lay
er would decrease the yield of usable pulpwood from loblol
ly pines by 30 percent, said Dr. Joseph Sullivan, researcher
at the University of Maryland. Sullivan uses suspended sun
lamps to simulate the Increased ultraviolet radiation reach
ing the earth's surface because of ozone depletion. Loblolly
pines supply two-thirds of U.S. wood pulp. Photo by Norman E.
Pruitt, Maryland Agriculture Experiment Station.
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Ozone layer depletion will have significant effects on
plant life, according to Dr. Alan Teramura at the University
of Maryland. Teramura’s greenhouse and field tests indi
cate that a 40 percent decrease in ozone, and the resultant
Increase In ultraviolet radiation, would decrease the pulp
wood available from loblolly pines by 30 percent. Photo tyNor
man E. Pruitt, Maryland Agriculture Experiment Station.
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COLLEGE PARK, Md.
Chlorofluorocarbons (CFCs)
chemicals commonly present in
refrigerants, industrial cleansers,
and aerosols— escape and slowly
rise to that portion of the earth’s
atmosphere known as the
stratosphere.
As CFCs are degraded by sun
light, the resulting chemicals react
with and deplete the ozone layer
that absorbs harmful ultraviolet
(UV) radiation from the sun.
The burning by Earth’s occup
ants of fossil fuels for energy
releases carbon dioxide and other
“greenhouse” gases. These gases
are believed to trap excess heat
radiated from the Earth’s surface,
leading to global warming.
Debate continues nationally as
to the speed and extent of these
global threats. But how will global
warming, or the destruction of
Earth’s natural ozone “sun
screens,” affect the plants that
support human existence?
B