On 1500 metres above sea level, on the slope of the mountain Hallingskarvet, stands “Tvergastein’, the cabin of Norwegian philosopher Arne Næss. In this film, Næss tells about the concept of ‘deep ecology’, which was first introduced by him in 1973. One of the basic tenets of deep ecology is that nature has a value in itself, apart from its possible use value to humans. Next to being a famous mountaineer, Næss was been a longtime activist in the environmental movement.