according to geographer james wang, it's a huge gamble.ang: maybe later on, the shipping lines change their mind, not using shanghai as a hub. so, major shipping lines can go to another port near shanghai like ningbo, because decentralization in china at this moment means that local ports can compete with each other to attract those major shipping lines, to use other ports instead of shanghai. shanghai may lose, there's a possibility. so shanghai is trying to use both economic means and administrative means to make sure that in future, shanghai will be the only hub in that area. narrator: but more than rivers were clogged here. shanghai had to use all its muscle to deal with other kinds of congestion, too. xiang ( translated ): dramatic changes have taken place in shanghai in the last few year however, little or nhing was done about urban services in shanghai. this led to a number of problems. for example, the streets became choked with traffic, there was air pollution and a growing shortage of housing. the size of metropolitan shanghai ac