Carbon Cycle
Carbon is naturally put out into the atmosphere by respiration and decomposition, the same amount is taken out of the atmosphere by plants by doing photosynthesis. Humans burn fossil fuel, when we burn those fossil fuels we put out 9 times more carbon into the atmosphere, plants take in 5 of that carbon, but 4 of that carbon stays in the atmosphere. all of that is put out every year. As you can see in the picture to the left,