home *** CD-ROM | disk | FTP | other *** search
- 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.
-
-
-
-
-
-
-