The natural ecosystem contains a huge gene bank which has been tapped by man for centuries. In the past, wheat, rice, corn were all ordinary grasses. All domestic animals also derive from this gene bank. However, the nature itself, utilises this capacity most of all at the time of climatic changes. The capacity of the gene bank is enormous, but man disregards its importance and destroys the precious resources. It cannot be excluded that in the future wild or semi-wild varieties of e.g. fruit trees will be more valuable than gold.