Canadian University of Toronto and the World Bank, a comparative analysis of the ecological status of hundreds of communities in 33 countries. His results were quite surprising.
The city accounts for about 71% of large-scale emission of harmful gases
It turned out that in such large cities as New York, London and Shanghai air pollution is much less than, for example, in cities such as Rotterdam or Denver, if you count the amount of harmful substances, which come to every human being.The city accounts for about 71% of large-scale emissions of harmful greenhouse gases effect. But not always to blame for this, only large metropolitan area. Observed that, where people have more opportunities to use public transport, pollution is considerably less. For example, for every inhabitant of Denver with a population of about 600,000 people, have 2 times more emissions than a citizen of New York, with its nearly 9 million people and a huge underground. The same story is repeated with the Canadian Toronto, where the main polluters are also the suburbs, although they are neat villages, consisting of a beautiful little house, nice looking. But because of the remoteness of the place of work, shopping and entertainment opportunities to local residents often have to travel by car, while in the large urban centers, residential complexes in the atmosphere is much less exhaust, for shops and offices are often working side by side, and they are easier to walk.So, a small American town with his Denver emissions of harmful gases in the amount equal to 21.5 tonnes of carbon dioxide equivalent per person, far behind the huge left Shanghai (with emissions of 11.2 tons per person), the Greek Athena (from 10 , 4 m), as well as Paris (just 5.2 m). Of the major cities are the major pollutants major Chinese cities such as Beijing (with emissions of 10.1 tons per capita), and it is said that for the production of electrical energy using a lot of fossil fuel. On average for the country, the number of emissions of 3.4 tons per person. The worst ecological situation was in Rotterdam with its large port and development of heavy industry: there per urban inhabitant 29.8 tons of emissions (average in the Netherlands — 12.67 m). Also revealed a pattern: the richer the economy and colder the climate, the more pollution.The final conclusion of this study is that the size of the city and the number of its inhabitants are not critical to the contamination of the environment.