A final round of talks on a treaty to end plastic pollution opens on Monday, with the diplomat chairing the difficult negotiations warning nations not to miss a "once-in-a-generation opportunity". Plastic pollution is so ubiquitous that it has been found in clouds, the deepest ocean trenches and even in human…

A final round of talks on a treaty to end plastic pollution opens on Monday, with the diplomat chairing the difficult negotiations warning nations not to miss a "once-in-a-generation opportunity". "This treaty is a once-in-a-generation opportunity," he said.

A final round of talks on a treaty to end plastic pollution opens on Monday, with the diplomat chairing the difficult negotiations warning nations not to miss a "once-in-a-generation opportunity". "This treaty is a once-in-a-generation opportunity," he said.