Two questions, two answers: 1 It is a very old principle in responsible forestry to harvest the resource wood not exceeding the volume that is regrowing every year. I learned this basic definition of sustainability early in my studies of wood technology. Today the meaning of sustainability is much broader, and it is respected more and more in all aspects of life and business. It is definitely important for wood coatings. However, to me this appears not to be very special because ...