Economy operates in a broader social system, composed of households and enterprises but also by all institutions created by people. Law and politics is created and introduced in institutions in parallel to educational, administrative activities as well as any other social activities, including those related to the natural environment we live in. These institutions operate thanks to the social capital i.e. interconnected human resources. The quality of the social capital is dependent on mutual trust and relations in the society. For this reason, social capital is of key importance for sustainable development, both as a controller of the impact of the economy on the environment as well as the basis for the future development. The environment evolves continuously, there are rapidly changing economic processes and, in consequence, their impact on the environment is changing rapidly, tool. This brings some specific challenges to the resource and quality of human knowledge and the competence level of the human capital, as the only tool for a possible reduction of all imperfections.