Running for climate change: 'I was very much on the edge physically and mentally'

Emma Howard takes to the road with Erlend Mister Knudsen, one half of Pole to Paris, a campaign and journey by two scientists from the two polar regions of the world to crucial UN climate talks in Paris

The journey to next month's crunch UN summit on climate change has been long for many, but by time Dr Erlend Mister Knudsen reaches Paris, he will have travelled more than 3,000km.

On 3 August, the Norwegian scientist put down his books and decided to take another approach to communicating the threat of climate change: he started running from the Arctic towards Paris.