The Greenpeace ship the Rainbow Warrior has sailed up the Clyde towards the heart of Glasgow, with youth climate activists on board from areas most affected by global warming.
The charity had declared it was ready to defy a decision by the port authorities to block the vessel, saying the voices of the young campaigners deserved to be heard.
But the police in charge of summit security relented, allowing it to carry on, but not all the way to its destination.
There was some major disruption as it approached the city.