Today sees the start of the Edinburgh Science Festival – and Portobello has its part to play in the form of a photographic exhibition installed on ten scaffold frames on the Prom. It’s entitled ‘Human Nature’ but the theme is very much about the impact – good as well as bad – we are having on the planet. It first appeared a few days ago and has attracted a lot of attention locally, though Festival organisers fully expect the exhibition to draw visitors down from the city to view it. Porty Podcast Producer David Calder has been to take a long look.