Three eco-friendly pioneers are heading off on the journey of a lifetime - a 20,000km (12,427 mile) ride in a solar-powered tuk tuk from Bangkok to Toulouse, France.

Remy Fernandes-Dandre and Karen Koulakian from France, along with Ludwig Merz from Germany, set off on August 9 in a customised electric tuk tuk in hopes of traversing 15 countries in 120 days.

The trio, who have nicknamed themselves 'The Pilgreens,' plan to arrive in Toulouse in time for the United Nations Climate Change Conference in December.

Although covering such an expanse of distance may seem particularly ambitious, these three-wheel motorcycles can reach speeds of up to 100km/hr.

The plan has been in the works for quite awhile, but the group kept postponing their departure date. According to the photographer, Diego Azubel, they're a bit concerned about their current itinerary - especially the idea of crossing into Russia in the winter.

The Pilgreens' website explains that the three students are taking on such a challenge to show the world that 'electric power will be, in the long-run, the key energy to people's mobility.'

Hai Nhy