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1993-04-08
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THE WEEK, Page 33SOCIETYNo Silver Lining
Swiss greenhouses predict global warming may smother plants
Global-warming scenarios are mostly gloom and doom. As humans
burn more fossil fuels, more carbon dioxide (CO2) enters the
atmosphere. CO2 traps the sun's heat, causing a warmer climate,
rising sea levels and drastic changes in weather. The one
bright spot seemed to be that because plants "breathe" CO2, they
might be expected to thrive.
Not necessarily, it turns out. A study of two artificial
rain forests created inside greenhouses at the University of
Basel, Switzerland, indicates that too much CO2 can harm plants.
One greenhouse had an atmosphere like today's; the second had
as much CO2 as is predicted for the middle of the next century.
The effects: plants in the second rain forest produced starch
deposits that could interfere with photosynthesis, and the
soils they lived in showed a rapid loss of nutrients. The
scientists are now working with other experimental ecologies,
and the preliminary results are the same.