Bob Stoffel's job is -- among other things -- to help make UPS greener and more efficient. His title is the longest at the company: senior vice president, supply chain, strategy, engineering, and sustainability. The logic is that those functions fit together in a global economy where supply chains may be changing radically and UPS's customers must increasingly demonstrate sustainability to their own customers and investors.

Like virtually all top UPS executives, Stoffel has spent his whole career at the company, in his case starting as a part-time loader while attending the University of Illinois at Chicago. And, yes, he also did a stint wearing the famous brown uniform while driving what UPS calls a "package car" and everyone else calls a van. Today he's experimenting with virtually every green technology and reducing the company's carbon emissions by millions of tons annually.

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