A Beijing government think tank has made two ambitious proposals to tackle the capital's water shortage and air pollution, one involving the construction of a huge canal to Tianjin and the other creating a massive artificial fresh air intake in the municipality's northwest.Â
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But some scientists are not impressed, suggesting that the plans would be next to useless in easing environmental pressures.Â
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The Beijing Academy of Social Sciences (BASS) outlined the plans in two reports released this week. The first proposed building a canal - a kilometre wide and 160km long - from Tianjin to the capital to carry desalinated, treated potable water sourced from the polluted Bohai Gulf.Â
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The canal could also ease smog by allowing dry land along its banks to be irrigated to stop fine dust particles wafting into the capital, BASS said.Â
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Beijing would have to desalinate seawater from the Bohai Gulf to ease the city's water shortage as its groundwater ran out.
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The other report suggested building two townships in the north-western suburbs of Nankou and Machikou to provide a wind portal to central Beijing.Â
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The authors envisaged using the local mountainous terrain as a natural "ventilation system" drawing wind from northwest China that could be "scrubbed" to remove much of the sand it carries in winter and spring.Â
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The report listed three wind belts for Beijing that would make best use of the city's topography, and urged the government to devise a plan to transform the Nankou-Machikou area from a belt of polluting heavy industries into a revitalised green zone.Â
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"Our present city planning attaches little importance to the protection and use of wind environments in suburban areas," said Ding Jun , associate researcher at the BASS Economics Research Institute and author of the report.Â
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However, Hu Fei , a researcher at the Institute of Atmospheric Physics at the Chinese Academy of Sciences, dismissed the proposals as "ridiculous suggestions from non-professionals". He said Beijing's air pollution was a systemic problem, and removing dust in a certain area would have very little impact.Â
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"It's like a dietary supplement that keeps a healthy person fit but won't cure someone who is already ill," he said. "Beijing is already very ill."Â
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Xia Qing , former deputy director of the Chinese Research Academy of Environmental Sciences, said the canal proposal not only risked raising soil salinity, but also defied physics.Â
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"The land is high in the west and low in the east. They're asking water to flow uphill," he said.Â