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University of Pardubice Jan Perner Transport Faculty Transport and ...

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The earth summit in Rio defined ‘Environmental sustainability as the process <strong>of</strong> making sure<br />

current processes <strong>of</strong> interaction with the environment are pursued with the idea <strong>of</strong> keeping the<br />

environment as pristine as naturally possible <strong>and</strong> sometimes referred to as meeting human needs<br />

without compromising the health <strong>of</strong> ecosystems.<br />

To sustain the environment, problems that threaten the environment have to be identified so that<br />

strategies <strong>and</strong> future plans can come in to action. Factors such as pollution, growing population,<br />

economic growth, poverty, <strong>and</strong> globalization have a negative effect on the environment. 24<br />

2.2.1 Factors affecting environment<br />

Pollution is the introduction <strong>of</strong> contaminants into a natural environment that causes instability,<br />

disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms.<br />

Environmental pollution consists <strong>of</strong> five basic types <strong>of</strong> pollution, namely, air, water, soil, noise<br />

<strong>and</strong> light: 25<br />

Air pollution<br />

Combustion <strong>of</strong> fuel is one <strong>of</strong> the major causes <strong>of</strong> air pollution in urban areas. Burning <strong>of</strong> fossil<br />

fuels such as natural gas <strong>and</strong> gasoline leads to the emission <strong>of</strong> carbon dioxide <strong>and</strong> other gases,<br />

which deteriorate the quality <strong>of</strong> air, making it polluted. Increased level <strong>of</strong> carbon dioxide in the<br />

atmosphere is one <strong>of</strong> the prime causes <strong>of</strong> air pollution which causes Global warming. Power<br />

plants exhaust fumes <strong>of</strong> automobiles, airplanes <strong>and</strong> other human activities involving the burning<br />

<strong>of</strong> gasoline <strong>and</strong> natural gas are related to the emission <strong>of</strong> this greenhouse gas. The<br />

chlor<strong>of</strong>luorocarbons (CFCs), a class <strong>of</strong> synthetic chemicals used in refrigerants <strong>and</strong> aerosol<br />

propellants, have caused hole in Earth's ozone layer. Sulphur dioxide is one <strong>of</strong> the components <strong>of</strong><br />

smog, which is related with contamination <strong>of</strong> the Earth's atmosphere. This synthetic chemical is<br />

the prime cause <strong>of</strong> acid rain. Air pollution is partially caused by the particulates formed by a<br />

24 Environment for Development [online]. 2010 [cit.2012.04.15]. Found from:<br />

http://www.unep.org/PDF/FinalMTSGCSS-X-8.pdf,<br />

http://www.unep.org/Documents.Multilingual/Default.asp?documentid=78&articleid=1163<br />

25 UNEP: Environmental problems [online]. 2010 [cit.2012.04.19]. Found from: http://www.unep.org<br />

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