This is a very simplistic model of the carbon stocks and flows for three wood products.
The time frame of simulation is 2010-2035, the time interval is 0.25.
Consumption factors determine the increase in consumption of wood products (as inflows of kt carbon).
The decay rate determines the half-life vallue of a wood products (as outflows of kt carbon).
The total carbon stock is the sum of all three wood products (in kt carbon)