Nigeria's Lagos state says it'll immediately start implementing a ban on Styrofoam and other single-use plastics.
Lagos's environment commissioner Tokunbo Wahab says non-biodegradable plastics were a major pollution problem, and were clogging drains.
State officials say they'll use a dormant 2009 law to fine or jail culprits.
International experts estimate Nigeria generates 2.5 million tonnes of plastic waste annually.

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