A Truly Clean City: How would you create a city that does not produce more
             air pollution than the atmosphere can cleanse naturally' In creating this
             more sustainable environment, consider livability, safety, and convenience
             One of the key aspects to creating a city that did not produce more
             air pollution than the atmosphere could absorb would be the development of
             a fully functional public transportation system, involving the creation of
             additional subway systems and the introduction of a comprehensive monorail
             system, to enable individuals to commute to work without the use of cars,
             or ideally, buses. In this ideal city, cars would be prohibited, or
             individuals would receive tax breaks for using public transportation
             (subsidized by the state) or for walking or cycling to work. Walking to
             work would be have to be made easier for the inhabitants of the city
             through the creation of well-maintained sidewalks, and underground
             thoroughfares under which individuals could walk as well as take the
             subway. Individual convenience would be addressed to some extent by
             specifically introducing additional transportation services designed to
             convey large numbers of people during key times of workplace traffic during
             the day and to popular entertainment venues at night.
             The increased foot traffic would also require additional security
             measures, particularly an increased police presence at night for solitary
             pedestrian traffic. To pay for the additional costs, taxationâ€"perhaps upon
             car-owning individuals, if cars were not completely prohibitedâ€"might be the
             logical solution. Taxation on businesses that generated air pollution
             might be another possible solution, as well as the prohibition of new,
             developing businesses that generated noxious fumes and waste.
             Another necessary component to this ideal city would be the
             introduction of trees and oth...