The world is set to get a global treaty to tackle plastic pollution. Nearly 200 countries have agreed to start negotiations on an international agreement to take action on the "plastic crisis". UN members are tasked with developing an over-arching framework for reducing plastic waste across the world. There is growing concern that discarded plastic is destroying habitats, harming wildlife and contaminating the food chain. Supporters describe the move as one of the world's most ambitious environmental actions since the 1989 Montreal Protocol, which phased out ozone-depleting substances.

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