When a rancher puts cattle in a pasture, what happens to the amount of grass in it? Cows put in a pasture of fresh grass will eat it down too a point it would regrow fast.. Unless the pasture is not large enough for the number of cattle. Then they will eat it into the ground and kill it.
Humans add to the carbon cycle by burning fossil fuels to make things run like factories and or running cars. People also add to the carbon cycle by resperating just like animals and when we die we get decompsed and add to it that way also