In many ways me quality of our environment tot deteriorated with each new advance of the economy. Increase in electric power production means the burning of more coal and fuel oil, and hence the discharge of more sulphur dioxide into the air. The growth of the paper  industry has brought a vast increase in trash. The production of polythenes has resulted in non-degradable bags that an a major source of pollution. The increase in new and reconditioned cars, trucks, and buses has resulted in choked cities. In short economic progress can have one unwelcome side effect: it ma: leads to unhealthy living conditions.