Technical study looking at the efficiency of changing rotation length in managing the carbon stocks of different forests in Europe using he CO2FIX model. Specific objectives of the study were (1) to quantify the effects of rotation length on the carbon stocks of trees, soil and wood products and (2) to estimate the size of forest areas where rotation lengths need to be changed to accomplish the largest carbon sink eligible under Article 3.4 of the Kyoto Protocol. The study also estimated the effects of the changed rotation lengths on harvest possibilities and considered the implications of the results for the reporting requirements of the sinks under the Kyoto Protocol.