The final round of United Nations-brokered talks aimed at tackling plastic pollution opened in South Korea with deep divisions over the need to stem the rising flood of the material, a rift that threatens to scupper a two-year long quest for a deal.

A last round of negotiations on a legally binding treaty to address the global scourge of plastic pollution has opened in Busan, South Korea. Here's what to know about it:Nations are deciding what actions they'll takeNational delegations still have a lot to hammer out before there is a treaty.

Many nations hope to reduce the half a billion tons of plastic made each year. But pushback from plastic and oil producers, and Donald Trump’s election, could scuttle an agreement.