Edie: Three environmental campaigners have set off on a round-the-world bicycle trip to show the potential of solar power in the fight against climate change. Mayor of London, Boris Johnson, saw them off from outside City Hall on Friday (15 May) as they set off towards the coast on the first leg of a nine month journey. The three Susie Wheeldon, Jamie Vining and Iain Henderson will be equipped on their expedition with a set of custom built thin-film PV solar panels on their …