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"Always listen to experts. They'll tell you what can't be done and why. Then do it."
- Robert Heinlein

Dozer  
  A person with extreme susceptibility to the greenhouse gas carbon dioxide.  

In the near-future world of Earth, the excess carbon dioxide causes not only an increased greenhouse effect.

The crowds suddenly parted and more police hove into view, wrestling along a figure swaddled in restraint netting, who howled and writhed, wild-eyed, with face and clothes flecked in blood and spittle. A green gas cannister at his belt showed him to be a dozer - one of those unfortunates more affected by excess carbon dioxide than other people. In most, such borderline susceptibilities caused little more than sleepiness or headaches. But sometimes a wild mania resulted...
From Earth, by David Brin.
Published by Bantam in 1990
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