This is the third round of talks to develop an international legally binding deal that includes plastic waste in the ocean.
Football's governing body will mark the 100th anniversary of the World Cup in Uruguay, where the first was held in 1930.
The summit ended with support for creating a "zero draft" treaty ahead of the next negotiations at Nairobi in November.
About 69% of all the plastics produced, mainly through fossil fuel burning, are used just once or twice before they are thrown away. About 22% is mismanaged. Just 9% is recycled.
Difficulties in hiring non-European staff and overcoming perceptions of corporate secrecy weigh on the sports body.
A World Health Organization commission ratcheted up pressure on governments to fight a worldwide epidemic of noncommunicable diseases, but couldn't agree on whether to recommend taxing sugar-sweetened beverages.