Question

select the correct answer.
both human activity and natural forces contribute to the levels of carbon - dioxide in the atmosphere. which of the following contributes solely by human activity?
a. volcanic eruptions
b. forest fires
c. using fossil fuels for energy
d. respiration

Explanation:

Volcanic eruptions are natural processes. Forest fires can be natural (e.g., from lightning - strikes) or human - caused, but not solely human - caused. Respiration is a natural biological process. Burning fossil fuels for energy is an activity mainly done by humans and releases carbon dioxide into the atmosphere.

Answer:

C. burning fossil fuels for energy