Both the development of the civilization today as well as the lifestyle of the society based on the consumption do not always involve the behaviours dealing with providing the mental picture of lives according to the laws of nature and its respect. The causes of this situation may result from the variety of educational negligence and the materialistic lifestyle created by the mass media. The level of the consciousness can be significantly improved due to the competent preparation of the future teachers to realize the issues of the ecology and of the “sustainable development” in the educational process. There was the investigation carried out to find out the level of the respondents’ knowledge and to get the comprehensive knowledge on the required problem, i.e. if and to what degree the students of the natural science specializations were prepared to realize the issues of the sustainable development. The number of 297 students was involved in the investigation. They represented the following specializations: biology, geography and chemistry in their universities.