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For most companies, the largest figure in the carbon inventory is not the office, the vehicle fleet, or the electricity bill. It sits upstream, in the goods and materials a business buys to make and sell its products. These purchased inputs form the bulk of a company’s Scope 3 emissions, which routinely exceeds everything the business controls directly, and can add up to 90% of their global footprint.

Leah Stokes, professor of environmental politics at U-C, Santa Barbara, in New York Times, The Big Threat Has Been Climate Change. Now Comes A.I., Sept. 22.