Iceland has seen an explosion in tourism in recent years. But at what cost? Edwin Lane speaks to Grimur Saemundsen, chief executive of the Blue Lagoon in Iceland, a geothermal tourist attraction. Economist and former government minister Gylfi Magnusson discusses the economic boost tourism has provided. And Inga Hlin Palsdottir, director of Visit Iceland, asks where there is such a thing as too many tourists. (Photo: Iceland-themed souvenirs on sale in Reykjavik, Credit: Getty Images)