How green is your city? And how do you know?

Suppose a real-estate developer in Manhattan is constructing a new office building, and the architect decides to use granite as a primary material. There is a good chance the granite will come from a quarry in Minais Gerais, in southeastern Brazil. From there, it may well be shipped to Carrara, in northern Italy, where much high-grade stone is processed into building-ready form. Then the granite will be shipped to New York, although some of it may be rejected, leading to new rounds of cutting, shipping, and inspections on three continents.

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