After analyzing the origins of environmental ethics the Author describes the various non-anthropocentric theories in order to criticize their significance. Then she examines the anthropocentric theories. She describes "moderate" or "weak" anthropocentrism based on the idea of a duty to defend and preserve nature and which admits a kind of limited moral relevance of nature in its relationship with man. In conclusion, it is auspiciated a collaborative action of all anthropocentric philosophic models to realize an authentic environmental protection.