Abstract

To come to a common background, let us define the renewable material resources (RMR). RMR are those resources of biological origin, sometimes called biomaterials [7]. The essential characteristic of these resources consists in that they are-or were-alive, i.e., a form of natural life and, hence, an ecosystem of its own right and a part of a larger ecosystem. This means that RMR carry, though in a miniature form, the genetic code of our “mother” nature and the cyclicity of life and death. A second important characteristic of these resources consists in that they are totally produced using the renewable energy of the sun via the photosynthesis process [14]. Here we are talking about the RMR of plant origin, which, are actually a manifestation of the great process of renewal of natural structures (micro and macro). The RMR of animal origin are-or were-those forms of organic life relying totally or basically on materials, produced by sun energy, i.e., RMR of plant origin.