Global aluminum flow

Source: Bertram, M., Martchek, K., Rombach, G., 2009. Material Flow Analysis in the Aluminum Industry.

This is an interesting variation on the Material Flow Analysis diagram.  Both processes and flows are accented by scaled circles representing the mass of each.  The only system boundary is between material and metal, I assume because the system is aluminum on the entire planet.  The article’s conclusion contains a nice passage about how Material Flow Analysis has been useful:
The MFA models created by the aluminum industry have proven to be very useful tools for communicating, lobbying, closing data gaps, and developing business strategies.

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