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Companies Start Paying Off 'Carbon Debt' to Erase Past Sins

A Danish window-maker joins Microsoft in the emerging trend of trying to account for greenhouse gasses emitted deep in the corporate past.

Satya Nadella, chief executive officer of Microsoft Corp., speaks during a climate initiative event at the Microsoft Corp. campus in Redmond, Washington.

Satya Nadella, chief executive officer of Microsoft Corp., speaks during a climate initiative event at the Microsoft Corp. campus in Redmond, Washington.

Photographer: David Ryder/Bloomberg

Companies routinely set targets for reducing their greenhouse gas emissions. But a new kind of environmental target is emerging that has been likened to paying reparations to victims of past injustice. The idea is to eliminate not only current pollution but also to account for and counteract climate damage from the corporate past.

The first big company to make such a pledge was Microsoft Corp. In January it announced plans to remove enough greenhouse gas to zero out its emissions and energy use dating back to its founding in 1975—some 27.3 million tons of carbon dioxide. Now on Tuesday, Velux A/S, a Danish maker of roof windows, pledged to eliminate carbon dioxide that matches its estimated emissions since its founding in 1941. That effort, along with a new 2030 climate goal, would allow Velux to claim “lifetime carbon neutral” status by its centenary in 2041.