Bike-sharing took off in China, where many city dwellers battle smog and bikes offered a potential clean alternative. Now, without the infrastructure to support them, and an over-saturation in the sharing market, abandoned bikes have piled into massive graveyards in cities like Shanghai and Beijing – forcing us to ask: are bicycles polluting metropolises they were intended to aid?

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The Atlantic reported bike sharing growth surpassed demand and Deutsche Welle (DW) said that bikes are piling up into massive graveyards. 16 to 18 million bikes hit streets in China from around 60 companies, TIME said, and most cities weren’t prepared to handle the influx. There aren’t any set docking stations or bike stands, so most bikes are just parked on the side of the road, according to the publication. Back in December, Fortune reported the co-founder of bike-share startup Ofo, Zhang Siding, said, “The bike-sharing phenomenon has grown very quickly in the last few years, but the layout and infrastructure [of] cities in China aren’t something that can be changed as quickly to accommodate this new trend.”

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Related: China’s largest bike share launches air-purifying bicycles for 20 million citizens

Bike graveyards have grown as some bike-sharing companies fold, and their surplus bicycles sprawl in vacant lots. DW said police now have to gather unwanted vehicles from roads and parks, and pile them in fields out of city centers.

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According to Fortune, last year Ofo launched a credit score system: users would be penalized for antisocial behavior like traffic violations or bike dumping, and rewarded for positive behavior, like reporting damaged or lost bikes. If users’ points were all deducted, they’d be barred from the service.

They were also reportedly working with interest groups in cities to come up with new strategies — for example, in Guangzhou, traffic wardens or local groups can send feedback to the company if bikes are accumulating and Zhang said, “we’ll send people down to deal with it.”

Health and air quality benefits are still present with bike-sharing, and The Atlantic said the trend is still popular, and bike-sharing will likely keep growing — just maybe at a slightly more sustainable rate.

Via The Atlantic, TIME, Deutsche Welle, and Fortune

Images via Philip Cohen on Flickr, Chris on Flickr and Wikimedia Commons (1,2)