Environmental Problems: 

(i) The large urban population in developing countries not only uses but also disposes of a huge quantity of water and all types of waste materials. 

(ii) Many cities of the developing countries find extremely difficult to provide the minimum required quantity of potable water and water for domestic and industrial uses. 

(iii) An improper sewerage system creates unhealthy conditions. Massive use of traditional fuel in the domestic as well as the industrial sector severely pollutes the air. 

(iv) Domestic and industrial wastes are thrown into the general sewerages or dumped without treatment at unspecified locations. Huge concrete structures erected to accommodate the population, play a major role to create heat islands. 

(v) Urban-rural linking are of crucial importance for the sustainability of human settlements. Rural to urban migration has steadily increased in developing countries, which put an great pressure on urban infrastructure and services that are under serious stress.