By Lakdasa Wijetilleke, Suhashini A. R. Karunaratne, Suhashini Karunaratne (A. R.)
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Additional info for Air quality management: considerations for developing countries, Volumes 23-278
5° C in this period. Global temperature changes of 1° to 2° C have typically taken 1,000 to 10,000 years, and a rise of 5° C was responsible for bringing the Earth out of the last ice age. Drastic changes in the global temperature could cause a shift in climatic zones, changes in patterns of rainfall, more extreme weather conditions, and a rise in the sea level that could seriously affect life in many countries. If global warming continues unchecked, melting of the polar ice caps could raise the ocean level 5 to 6 meters by the end of the 21st century, flooding low-lying coastal areas all over the world (Environmental Update 1990).
Page 3 Bacterial action in the soil, volcanic eruptions, and lightningall natural eventsput much greater amounts of oxides of nitrogen into the atmosphere than human activities. Natural emissions are diluted over the entire planet, however. 4 micrograms per cubic meter (mg/m3) worldwide, the average annual mean in urban areas ranges from 20 to 90 mg/m3 (World Bank 1988:218), illustrating both the damaging effects of human activity and the potential for remediation. Suspended Particulate Matter Suspended particulate matter (SPM), particles 10 microns or less in size, remain in the atmosphere longer than larger particles.
Diesel oil reformulation is expensive, but it should have higher priority in developing countries where diesel consumption is high. Page 11 Increasing Use of Alternative Fuels. Liquefied petroleum gas (LPG) and compressed natural gas (CNG) are cost-effective and environmentally beneficial options, if domestic sources of natural gas and LPG are available. It may even be cost-effective in countries that must import CNG and LPG. The major costs are the costs of liquefaction, regasification, and construction of port facilities.
Air quality management: considerations for developing countries, Volumes 23-278 by Lakdasa Wijetilleke, Suhashini A. R. Karunaratne, Suhashini Karunaratne (A. R.)