Forests are one of the most endangered ecosystems on our planet. Scientists estimate that only about 22 % area of the original rainforests is still more or less in the original undisturbed condition. Each year, we loose the area of rainforests in the size of two Czech Republics, where thousands of types of plants and animals live. Illegal extraction of wood is a very serious problem. It is estimated that 80% of trees in Brazilian Amazonia is cut down illegally. Almost a half of tropical wood imported to EU countries comes from illegal sources. Neither Czech nor European forest economy evades harsh practices damaging forests. In the Czech republic, the appearance of the landscape is still determined, at many places, by unnatural artificially planted above all spruce and pine monocultures. The health condition of Czech forests is one of the worst in Europe. The capacity of forests to absorb rainfall and resist various calamities, such as excessive reproduction of ambrosia beetles, is greatly reduced.