The organisers of the Blue Economy conference that has just closed in Kenya's capital, Nairobi, told the BBC the event had been a great success, but admitted they had made a mistake by allowing single-use plastic at the venue.
Ambassador Macharia Kamau said banning bottled water at the conference would have been a chance to lead the way in the fight against plastic pollution, and that it had been an oversight.
The BBC's Mayeni Jones at the conference said Norway and Canada committed hundreds of millions of dollars to improving maritime safety, protecting sea life and reducing ocean pollution.
Small island states, including Antiga and the Bahamas, pledged to ban plastic utensils and bags within the next two years.