past few decades, rapidly growing third world cities pose serious threats to the millions of people who live in them. (EPA)The rapid growths of urban areas have outpaced the ability of urban authorities to provide adequate facilities, such as the collection and disposal of household garbage. Some of the problem that are associated with the improper disposal of garbage include; a serious fire hazard, attraction of pests and disease carrying animals, creating health hazards, and local disposal by burning or dumping adds to pollution loads and clogs waterways, so increasing the dangers of flooding. Waste can take on many different forms: solid, liquid, gas, and energy in the form of heat or noise. The disposal of wastes usually falls into three different sources; air, oceans, and rivers. The disposal authorities are usually publicly owned and this common ownership has facilitated unregulated emissions of wastes. The two most commonly used options for waste disposal include landfills and incineration. Disposal for hazardous waste have tightened in developed countries, there has been a movement of both operations themselves to areas where legislation is less stringent or poorly enforced. International trends ultimately lead to the Basal Convention on the Control of Transboundary Movements of Hazardous Wastes, which came into force in 1992. The convention is based on a series of guiding principles originally adopted by OECD countries. (UNEP)The next problem that I will discuss is that of ozone which is three oxygen atoms that formed together. Ozone is not emitted directly, but is formed by complex set of chemical reactions involving hydrocarbons, oxides of nitrogen, and sunlight. Hydrocarbon and nitrogen oxides come from a variety of industrial and combustion processes. In typical urban areas, at least half of the pollutants come from cars, busses, trucks and off-highway mobile sources such as construction vehicles and boats. At high...
