On the other hand, the level of annual drain have followed a flat trend and remained below the level of annual increment that followed a gradual upward trend (Norwegian Forest and Landscape Institute [NFLI] 2012). As a result, biomass and thus carbon have accumulated in forest at an increasing rate in Norway over last few decades. This increasing trend is expected to continue in the future as well and thus the atmospheric CO2 removal by forest biomass and soil is also expected to increase.