Solar-powered boat is ideal for climate change research
6 September 2013 Last updated at 00:06 BST
The world's largest solar-powered boat has concluded a scientific expedition in London.
The MS Turanor PlanetSolar started its 2013 campaign by crossing the Atlantic in 22 days, beating its previous world record of 26 days.
It then became a research platform, as University of Geneva climatologist Professor Martin Beniston explains.