A new report from IUCN highlights the scale of the plastic problem in the Mediterranean.
The move is likely to reignite tensions with Greece over the sovereignty of waters in the eastern Mediterranean and ownership of natural resources.
New skirmishes - the deadliest since 2016 — have provoked international concern.
Cyprus has called for sanctions against Turkey over illegal drilling in the Eastern Mediterranean, but is offering a legal alternative.
European diplomats say Cypriot officials are threatening to veto sanctions against Minsk if the EU does not consider action over a separate dispute in the Mediterranean Sea.
US Secretary of State Mike Pompeo has urged Turkey to engage in dialogue and take no more actions to increase tensions with Greece in the Eastern Mediterranean.
The bloc's foreign policy chief said ministers will agree on sanctions on Belarus on September 21 while EU leaders will discuss restrictive measures on Turkey on September 24.
Heads of states of France, Greece, Cyprus, Malta, Italy, Spain and Portugal warned Turkey that "unless it ends its unilateral activities", the EU would "develop a list of further restrictive measures".
A massive search and rescue operation is underway in Turkey's Black sea region after flooding washed away roads and buildings.
A source in the presidential palace has told Euronews' Turkish service that President Erdogan will be announcing the discovery of a new natural gas source in the Mediterranean on Friday.