Deforestation would result in a decrease in the carbon sink.
Increased use of alternative energy sources such as solar and wind energy would result in a decrease in released or sourced carbon.
If we consider non-industrialized countries, the model would remain the same.
If global warming continues, we would expect a change in the amount of carbon found in the ocean reservoir.
Combustion of fossil fuels acts as a carbon sink.
All carbon in the atmosphere is made by humans.