Why is preservation of biological diversity important?

People, who don’t like to think, sometimes ask: “And what for do we have to protect wild animals?” It is possible to tell a lot of different “because” on this “what for”. The problem of wild animals saving (and of biological diversity) has many moral, aesthetic, ecological, genetic, economic and other moral, scientific and economic aspects. The diversity of life on Earth - biological diversity – is the foundation for existence of mankind and living nature itself. Loss of biological diversity is about to undermine the foundation for global sustainable development. A wealth of diversity means that nature can more easily adapt itself to the influences from human. Diversity can be regarded as an insurance fund for the production basis and life environment for future generations.