Question

In which ways are humans adding carbon to the carbon cycle? Choose all that apply.

Through respiration.
Burning fossil fuels.
Using electricity.
Through photosynthesis.

Answer 1

i would say

Burning fossil fuels.

Step-by-step explanation:

Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere.