Abstract
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.