>> iceland is a beautiful country, and we also have a responsibility to protect our nature. >> reporter: there is no getting around the fact that all those people coming to iceland are actually making the climate issue worse by flying. >> i absolutely agree with you. we are an island in the middle of the north atlantic, and most of the people come on airplanes. >> reporter: mile per mile, air travel is the most damaging form of transportation for the planet. just one roundup trans-atlantic flight emidst twice as much planet-warming carbon dioxide emissions per person as driving the family car for an entire year. >> if people are coming here because they want to see something that is disappearing, it is our responsibility to tell people why and what they can do to prevent it. >> reporter: thure tiefts must t love this. >> yes, they are amazed. >> reporter: the tourism boom