A clean environment ensures the continual existence and survival of life on Earth. Clean environment means absence of pollution, preserved unique ecosystems, nonextinction of endangered species and conserved resources, such as water, land and air. A clean environment guarantees the protection of biodiversity and ecosystems where human and all other forms of life coexist forever on earth. Nature is endowed with a mechanism of self-cleaning of the waste or unwanted material generated by it. Animal carcasses are eaten up by other animals or insects. Similarly dead plant tissues and animal waste are eaten by termites and insects and further degraded by saprophytic microbes until mineralization of the organic material and its mixing with the soil. As waste for one can be a resource for another species, hence, no material on this planet can be considered as waste. Natural materials are used subsequently by animals and plants as food and manure, respectively. However, most of the man-made materials become waste substances after the intended use.