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Microsoft leads fast-growing move by companies on carbon pricing

Motivated by moral conviction and expectations of tougher laws, firms are scrambling to calculate just how much energy they use

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Microsoft charges its business units an internal tax based on their energy usage. The money goes into a common fund that invests in environmental sustainability projects.

New York

WHEN Microsoft business unit managers calculate their profits or losses each quarter, they consider more than just sales and expenses. They also factor in the price of carbon.

Even more radically, the business units are charged an internal tax by Microsoft based on their