Microsoft's carbon emissions climbed roughly 25 percent last year, to around 20 million metric tons of carbon dioxide equivalent from about 16 million the year before, the company said in its annual sustainability report. The increase, Fortune reported, was driven largely by the construction of data centers to power artificial intelligence, and it puts fresh strain on the company's pledge to be carbon negative by 2030.
The scale of the build-out
Microsoft is expanding its computing capacity at a striking pace, adding roughly a gigawatt of data center capacity every three months to keep up with demand for AI and cloud services. That growth, more than any single facility, explains the rising footprint: more buildings, more servers and more electricity to run and cool them all.
The company says it matched all of its global electricity use with renewable energy over the year. But in its report, Microsoft attributes a sharp rise in emissions tied to purchased electricity to the buildout and to a shift away from relying on some renewable-energy certificates from existing projects, choosing instead to pursue new sources of supply. The result is a widening gap between headline renewable commitments and the emissions the expansion actually generates.
The pledge under pressure
Microsoft set out in 2020 to become carbon negative, removing more carbon than it emits, by the end of the decade, and to erase its historical emissions by 2050. Those goals now sit awkwardly against a footprint that has grown, not shrunk. The company says it remains committed to the targets and has increased its investments in carbon removal, but it has not disguised the difficulty.
In the report, the company's president, Brad Smith, and its chief sustainability officer, Melanie Nakagawa, wrote that "while AI infrastructure is driving demand for energy, water, land and materials, sustainability solutions are not scaling fast enough to meet demand." To feed that demand, Microsoft has struck power deals including a long-term agreement to draw electricity from a natural-gas plant to be built in Texas, alongside earlier moves into nuclear supply.
A wider industry problem
Microsoft is not alone in the bind. Across the technology industry, the race to build AI has sent power demand soaring, and forecasts point to data center electricity use rising steeply over the coming years. That collision, between the energy AI consumes and the emissions cuts that climate targets require, is becoming one of the defining questions for the sector. Microsoft's numbers put a figure on it: even a company that has made sustainability central to its brand is, for now, moving in the wrong direction on emissions, and betting it can still turn back.
