Spaceship Earth is a worldview encouraging everyone on Earth to act as a harmonious crew working toward the greater good.

Henry George was an American political economist and journalist. His writing was immensely popular in 19th-century America and sparked several reform movements of the Progressive Era. He inspired the economic philosophy known as Georgism, the belief that people should own the value they produce themselves, but that the economic value of land should belong equally to all members of society. George famously argued that a single tax on land values would create a more productive and just society.