The present thesis deals with the ever increasing environmental crisis which the world is facing today and which, as the thesis is supposed to show, is closely linked with a deep crisis of meaning. In the course of the thesis, various approaches to this crisis are shown and analyzed. In the first part of the thesis the most important aspects of the ethics of nature are treated, among others various types of bio- and anthropocentric approaches to nature, the deep ecology movement, the question, whether nature has values and the implications thereof, ways in which nature can be useful to humans, the relationship between religion and environmental protection and so forth.The second part of the thesis which is referred to as ?diagnosis? tries to analyze the various ?symptoms? of the present crisis and their consequences. Moreover, it is shown how the present crisis differs from former types of crisis. As the most important symptoms the relentless striving for growth, human greed and a lacking sense of sustainability are identified. The various aspects of the crisis are treated in three chapters dealing respectively with greed and the striving after growth, the natural sciences and technology as well as over-population, environmental pollution and modern diseases.The third part of the thesis tries to show how a possible sustainability paradigm could look like. At first, the possibility of a paradigm shift in the near future is dealed with. Then, the ethics of a new paradigm is outlined. Afterwards, the various aspects of the sustainability paradigm are shown in chapters dealing, among others, with the political system to promote a new paradigm, aspects of economy, technology, use of energy, life style and so on.In the fourth part of the thesis, the proposals enumerated in the third part are critically analyzed as to their feasibility.