This chapter summarizes the soil functions for human civilization. The most important is the way of
the soil preservation. Land quality is considered from six point of view including agriculture, forestry, human
well being, sustainability of eco-systems. The role of soil in the process of the sustainability of human civilization
is a main goal of this chapter. Thus, soil is a leading component of bio- sphere, where plants are the direct link
between solar energy (photosynthesis) and humus production in the soil.
