Which one of the following is a source of carbon dioxide in the troposphere?
A)natural gas seepage
B)electrical discharges
C)fossil-fuel combustion
D)volcanic gases
E)forest fires

Question

Quizplus · Accepted Answer

Fossil-fuel combustion releases carbon dioxide into the atmosphere, which is a major contributor to the increased levels of this gas in the troposphere. Natural gas seepage, electrical discharges, volcanic gases, and forest fires also emit carbon dioxide, but their contributions are relatively smaller.

Which One of the Following Is a Source of Carbon