The decision was announced in July and came into force
In China, some recycling companies have had to lay off staff or shut down due to the lost business.
The ban bars imports of 24 categories of solid waste, including certain types of plastics, paper and textiles.
"Large amounts of dirty... or even hazardous wastes are mixed in the solid waste that can be used as raw materials. This polluted China's environment seriously," the environment ministry explained in a notice to the World Trade Organization.
In 2015 alone, the Asian giant bought 49.6 million tonnes of rubbish, according to the latest government figures.
The European Union exports half of its collected and sorted plastics, 85 percent of which goes to China. Ireland alone exported 95 percent of its plastic waste to China in 2016.
That same year, the US shipped more than 16 million tonnes of scrap commodities to China worth more than $5.2 billion.
Read more at: https://phys.org/news/2018-01-china-import-upends-global-recycling.html#jCp
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