What is your interpretation or definition of the scientific term 'water self-purification'?

This term exists in science for years and years. However it is not as popular as the terms: environment, environmental science, ecology, natural resources. Why? What are your thoughts when you think of the term, the biosphere?

Some of my thoughts on the biosphere are written in these research items:

Some of my publications related to issues of the biosphere are presented here:

The anthropogenic global change in the environment and biosphere is a serious hazard. I tried to contribute to the analysis of this issue in some publications of mine, e.g.:

To what extent does the lack of access to clean drinking water and sanitation facilities constitute a serious problem for millions of people worldwide, lead to disease and hamper socio-economic development? How can this problem be reduced by increasing access to clean drinking water and sanitation facilities? Is the construction of deep wells the best solution to this problem? What are the options besides drilling deep wells? How should developed countries organise their aid to developing countries in this regard?

In my opinion, the lack of access to clean drinking water and adequate sanitation is a global problem that affects millions of people around the world, with enormous consequences for their health, socio-economic development and quality of life. Contaminated water is the source of many diseases, such as cholera, typhoid and diarrhoea, which particularly endanger children and the elderly. The lack of access to drinking water forces people, especially women and children, to spend many hours searching for it, which limits their opportunities for education, work and development. In addition, the lack of sanitary facilities makes it difficult to maintain hygiene, favouring the spread of diseases and worsening the general state of health. This problem also has serious social consequences, leading to conflicts and migration, as well as hampering economic development by limiting productivity and investment opportunities. An effective solution to this problem requires a comprehensive approach, including investment in water and sanitation infrastructure, protection of water sources, promotion of water saving and hygiene education. Research plays an important role in solving this problem by providing the knowledge and analysis necessary to develop effective strategies and technologies. One of the important solutions to this problem is the construction of deep wells. First and foremost, financial and technological capital is needed to build wells. Highly developed countries are best equipped in these categories of capital, and deep wells are particularly lacking in economically underdeveloped countries and those heavily burdened by the effects of climate change, the progressive process of global warming, including increasingly frequent and increasingly burdensome periods of drought for people and natural ecosystems, the steadily decreasing amount of rainfall, the decreasing surface and underground water resources, rivers and lakes drying up, etc. Therefore, the developed countries should increase the organised aid to the economically underdeveloped countries in this matter.

I have described the key issues concerning the problem of the progressing process of global warming, the negative effects of this process and, consequently, the necessity to increase the scale and accelerate the implementation of the process of green transformation of the economy, climate protection, biosphere and biodiversity of the planet in the following article: