Brazil issued this coin in conjunction with the United Nations Conference on Environment and Development — the "Earth Summit" — held in Rio de Janeiro in June 1992. It was one of the largest intergovernmental conferences ever convened at that point, drawing 172 nations and producing the framework documents that eventually seeded the Kyoto Protocol. The cruzeiro itself was already a dying currency: Brazil had burned through the cruzado, the cruzado novo, and returned to the cruzeiro in 1990, only to replace it with the cruzeiro real in 1993 before the stabilizing real arrived in 1994.
Brazil issued this coin in conjunction with the United Nations Conference on Environment and Development — the "Earth Summit" — held in Rio de Janeiro in June 1992. It was one of the largest intergovernmental conferences ever convened at that point, drawing 172 nations and producing the framework documents that eventually seeded the Kyoto Protocol. The cruzeiro itself was already a dying currency: Brazil had burned through the cruzado, the cruzado novo, and returned to the cruzeiro in 1990, only to replace it with the cruzeiro real in 1993 before the stabilizing real arrived in 1994.