and continued: "The closed economy of the future might similarly be called the 'spaceman' economy, in which the earth has become a single spaceship, without unlimited reservoirs of anything, either for extraction or for pollution, and in which, therefore, man must find his place in a cyclical ecological system". This "cowboys in a spaceship" theme would eventually be taken up by scholar David Korten in his 1995 book When Corporations Rule the World. The phrase was also popularized by Buckminster Fuller, who authored the 1968 book Operating Manual for Spaceship Earth. This quotation, referring to fossil fuels, reflects his approach: ... we can make all of humanity successful through science's world-engulfing industrial evolution provided that we are not so foolish as to continue to exhaust in a split second of astronomical history the orderly energy savings of billions of years' energy conservation aboard our Spaceship Earth. These energy savings have been put into our Spaceship's life-regeneration-guaranteeing bank account for use only in self-starter functions. United Nations Secretary-General U Thant spoke of Spaceship Earth on Earth Day March 21, 1971 at the ceremony of the ringing of the Japanese Peace Bell: "May there only be peaceful and cheerful Earth Days to come for our beautiful Spaceship Earth as it continues to spin and circle in frigid space with its warm and fragile cargo of animate life." Spaceship Earth is the name given to the diameter geodesic sphere that greets visitors at the entrance of Walt Disney World's Epcot theme park. Housed within the sphere is a dark ride that serves to explore the history of communications and promote Epcot's founding principles, "[a] belief and pride in man's ability to shape a world that offers hope to people everywhere." A previous incarnation of the ride, narrated by actor Jeremy Irons and revised in 2008, was explicit in its message: Like a grand and miraculous spaceship, our planet has sailed through the universe of time, and for a brief moment, we have been among its many passengers... We now have the ability and the responsibility to build new bridges of acceptance and co-operation between us, to create a better world for ourselves and our children as we continue our amazing journey aboard Spaceship Earth. The term "Spaceship Earth" is frequently used on the labels of Emanuel Bronner's products to emphasize and promote his belief in the unity of humankind. See also Collective intelligence