What can the world learn from Växjö, Europe's self-styled greenest city?

In 1991, the southern Swedish city became the first in the world to declare its intention to become fossil-fuel free. So how much progress has been made, and does Vixji offer a blueprint for bigger cities too?

Within minutes of meeting the mayor of Europe's self-proclaimed greenest city, it is clear where he draws much of his inspiration from.

It's not just the fact that 61-year-old Bo Frank is wearing a black Beatles T-shirt and has a Beatles badge pinned to the lapel of his jacket. When he shows me into his office on the ground floor of Vixji city hall, Fab Four memorabilia is everywhere you look - along with photos of Sweden's king and queen, Barack Obama, and a black-and-white sketch of himself with long hair and a flowered shirt from when he was first elected to Vixji (pronounced Veck-Ruh) city council 41 years ago.