All-solar boat circumnavigates globe

The world's largest solar-powered boat has reached Asia, as it makes its way around the globe.

The world's largest solar-powered boat has reached Asia, as it makes its way around the globe.

Planet Solar, skippered by Swiss Raphael Romjan, relies solely on energy from the sun.

The crew set sail from Monaco in 2010, with the hope of raising awareness of clean energy sources.

CNN's Anna Coren reports.