Sir Patrick Vallance has joined colleagues around the world in urging leaders to make landmark pledges at next week's Cop26 climate summit.
He's been speaking on board RRS Sir David Attenborough - the polar research ship which is now ready for its first expedition.
It’s the ship that was voted to be called Boaty McBoatface by a public poll which was overruled.
Speaking at the launch, Sir David echoed the CSO’s thoughts.