Carbon molecules move between living and nonliving components of the Earth system in the carbon cycle. Biological processes, such as photosynthesis, cellular respiration, digestion, and excretion transfer the molecules into and out of living beings. Physical and geological processes transfer the molecules between non-living reservoirs where carbon compounds are in high supply. Transfers between living and non-living reservoirs in the cycle are called fluxes. The relative amounts of carbon stored in the reservoirs are called carbon loads. For example, there are carbon loads in the air, plants, animals, soils, fossil fuels, and oceans. Changes in human activities over time influence fluxes in the carbon cycle.
What human activities seen in the picture below can increase carbon load?