Moreover this situation with lack of water is exacerbated by malfunction of sewer systems. But to understand the causes of scarcity of water in Mexico and to evaluate the policy of the government in this sector, it needs to be observed thoroughly. Mexico is high-urbanized country. Almost 78% of its citizens live in cities (Castro and Heller 2009). That is why citizens of urban areas suffer the most from the appreciable water shortage.
In Bangkok, owing to the increase of motor vehicles, the continuous emission leads to the sharp decline of air quality which creates negative impacts on the daily life of residents. In Mexico, according to Yip, M and Madl, P(2002), the main source of air pollution are also vehicle exhausts which contain several toxic substances such as ozone, nitrogen dioxide and carbon monoxide. These chemicals can cause respiratory illnesses and even lung cancer. In Dhaka, from the analysis of World Health Organisation Bangladesh, the water pollution can be another problem because of “the absence of alternative safe water supply solutions”. Arsenic contamination of ground water is mainly caused by the use of hazardous chemicals and radioactive material in industry, and then it results in health risk on humans.
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According to Molden (2010), “one-third of the world’s population has to contend with water scarcity, and there are ominous signs that this proportion could quickly increase”. This means that the current rate of development has both positive and negative effect on society and, of course, the environment. However, the problem of water shortage is rather different in both developed and developing countries. While it reduces the economic growth and damages the life quality in developed countries, already low rate of development and faint state of life are under the greatest threat in poor countries. As a result, the problem of water shortage can cause catastrophic consequences for future generations of those countries.
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