Final answer:
Building extra public toilets has major social, economic, and environmental implications. The economic return on investments in sanitation is high, while also ensuring equal access and contributing to a cleaner environment. Historical precedents emphasize the long-term benefits of well-planned sanitation systems.
Step-by-step explanation:
The construction of extra public toilets is a subject with considerable social, economic, and environmental importance. Justification for the number of facilities needed involves assessing the current sanitation demands and the potential for improved public health outcomes. Historically, successful examples like Joseph Bazalgette's overhaul of London's sewer system underscore the vital role sanitation plays in urban environments.
Investing in sanitation infrastructure like public toilets can lead to substantial economic benefits. According to the World Health Organization (WHO), every dollar spent on improving sanitation systems can result in an average global economic return of 5.5 dollars. Beyond economic returns, such investments ensure equity and access to clean restrooms for all individuals, addressing the principles of fairness and openness in urban planning.
From an environmental standpoint, the example of a city emitting raw sewage into a lake illustrates the negative impacts improper waste management can have on ecosystems. The cleanup costs versus the overall benefits derived from a cleaner environment, as outlined in the provided data, show that there are tangible benefits to addressing sanitation challenges holistically.