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"Since the 1990s, some 20 million tonnes of industrial waste have been buried in this landfill site," said Futuris correspondent Julian Lopez Gomez, reporting from Houthalen-Helchteren in northeast Belgium. "It's a huge ecological challenge but also, maybe, an economic opportunity. Can all this plastic and metal be mined and recycled in efficient, sustainable ways? European scientists are digging deep in a search for answers."