Diplomats at a United Nations conference in Busan, South Korea, failed to reach agreement on the world’s first treaty to tackle plastic pollution on Sunday. They said they would reconvene in future months to try again.

Countries have deadlocked on a United Nations treaty on plastic pollution, according to The Associated Press. The treaty, with an aim of tackling worldwide plastic pollution, faced a hurdle due to negotiators not being able to get past the question of whether it should bring down the planet’s overall plastic while also having mandatory

The UN environment chief insisted Monday that talks on a landmark plastic pollution treaty were not a failure, saying important progress was made despite negotiations collapsing without agreement.