an American futurist, inventor, architect, engineer, mathematician, poet and cosmologist, is best known for his the invention of the geodesic dome–a structure constructed of lightweight bars forming a grid of polygons. The geodesic dome combines the structural advantages of the sphere (which encloses the most space within the least surface, and is strongest against internal pressure) with those of the tetrahedron (which encloses least space with most surface and has the greatest stiffness against external pressure). It is among the lightest, strongest, and most cost-effective structure ever devised. The dome is energy efficient because it requires less building materials, it has less surface area, and heat loss due to wind turbulence is lessened. Fuller was an early proponent of renewable energy sources, including solar, wind and wave, which he incorporated into his designs. He claimed, "There is no energy crisis, only a crisis of ignorance." Fuller also created the Fuller Projection, or Dymaxion ™ map of the world, the first world projection to show the continents on a flat surface without visible distortion and the first cartographic system to receive a patent. He also was the first to use the term “Spaceship Earth” (1951).