In this case, we have the carbon cycle, and as we can see there is no extra carbon input, this means that the same quantity of carbon remains on the planet, but in what state is, differs, in some cases, we can find it the atmosphere as carbon dioxide, or in organic matter as structural parts of living organisms, other in the form of oil. So in the carbon cycle, we can say that is recycled as there is no gain or loss of it, only change.