PROMPT:

A． carbon dioxide tends to alleviate environmental haze, while sulfurous gases usually increase it
B． carbon dioxide tends to increase temperatures by trapping sunlight, while sulfurous gases tend to decrease temperatures by blocking it
C． carbon dioxide tends to have an effect on the environment, while sulfurous gases for the most part do not
D． sulfurous gases have played an even more significant role than carbon dioxide in pushing environmental temperatures outside the habitable range
E． sulfurous gases tend to decrease the level of solar radiation outside the earth's atmosphere, while carbon dioxide plays only a negligible role

A． The influence of volcanic eruptions on global weather patterns is almost completely understood at present.
B． Scientists have only begun to understand, however, the effects of these wavelengths of light on the global environment.
C． The majority of global cooling effects have thus been attributed to volcanic explosions.
D． The human warming activities ameliorate by volcanic eruptions include those produced both by heavy industry and agriculture.
E． The reason that sulfate aerosols take an unusually large time to disperse owes primarily to meteorological factors, including the jet stream.