One of the benefits of phytoplankton is that it removes excess carbon dioxide from the atmosphere. what human activities contribute the most to increasing carbon dioxide levels? . a. smoking tobacco. b. dumping oil in the ocean. c. burning oil and coal. d. planting trees

The correct answer of the given question above would be option C. One of the human activities that would contribute in the increasing carbon dioxide levels and toxins in the atmosphere would be the burning of oil and coal. Burning of oil and coal would produce more carbon dioxide, which contributes to the formation of the greenhouse effect.