C5, is difficult to get the data, as large number of people are part time employment in forestry; and for employment in logging, there will be different between the logging mechaine and artificial.
C15, Percentage change in area of degraded forest: there is no accepted definition about the "degraded forest".
C14, Forest health and vitality: % of forest area disturbed: is also a indicator that data collection is difficult.
C20, recovery rates for paper and solid wood products (volume recovered for re-use as % of volume consumed): it is not about SFM.
C21, Carbon stocks and carbon stock changes in forest land: net forest GHG sink/source of forests, forest carbon stock, carbon storage in harvested wood products (Tons C): it will take a long time for many countries to report it, it is not operational.
Проф. Jingpin Lei