AUTONOMY:

A． the greenhouse gas effect produced by human activities tends to have a much greater environmental effect than that of volcanic explosions
B． clouds of sulfur-rich gases tend to achieve greater heights in the stratosphere than do ash clouds
C． a particular explosion producing high sulfur and little ash had a greater environmental effect than the converse
D． the burning of fossil fuels tends to exacerbate the effects of sulfurous aerosols, but not those of ash clouds
E． global warming effects tend to minimize the impact of ash clouds, but not those of sulfurous aerosols

A． The history of wildfires in North America demonstrates that controlled blazes have a positive effect on the environment, on the whole.
B． The capability of certain metal alloys to withstand great heat proves greater than that of another, confirming metallurgists' suspicions.
C． The study of seismological data proves that existing safety standards in construction will likely prove insufficient in the future.
D． One cigarette brand is found to cause fewer cases of cancer than another brand, disproving the notion that the first brand's contents are more carcinogenic.
E． Ideas concerning the causes of schizophrenia are complicated by the discovery of a rare new psychotic condition whose symptoms defy explanation.