Answer:
carbon cycle
Step-by-step explanation:
A carbon cycle is a cycle that is defined as the continuous transfer of the carbon from the earth to the atmosphere and back to the earth form the atmosphere.
Humans affects the carbon cycle to a large extend by cutting down trees and burning the fossil fuels. The vehicles running on the road also releases large amount of carbon into the atmosphere. Large industries and factories are also one of major cause for the increase in the carbon level in the atmosphere. It all affects the carbon cycle as more and more carbon is released into the atmosphere and very less is absorbed back due to less trees.