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The US power sector could release 42 percent more planet-heating carbon dioxide pollution by 2030 than it did in 2025 as it builds out more fossil fuel infrastructure to meet data center electricity demand, according to a new analysis by the Sierra Club. That would essentially wipe out 15 years of greenhouse gas reductions.

Data centers could send US climate pollution skyrocketing

Gas plants built for data centers are poised to undo more than a decade of climate action.

CO2 emissions from electricity generation would increase by 618 million tons by the end of the decade if planned AI projects are constructed. That’s roughly equivalent to carbon pollution from the electricity use of 128,788,523 homes in a year.

The Sierra Club’s estimate is higher than some previous projections

The Sierra Club’s estimate is higher than some previous projections from other groups. Another study published by academic researchers in June forecast that electricity demand from data centers and crypto mines could push up power sector emissions by 28 percent by 2030 when compared to a scenario with no data center growth. The outcome depends on how many planned data center projects actually come to fruition, as well as on what type of technology is used to power those facilities.

Net US greenhouse gas emission have fallen from a peak of about 6.58 billion metric tons in 2007 to about 5.35 billion metric tons in 2025. But that pollution started ticking back up last year as data centers drove up electricity demand. The Trump administration is incentivising the buildout of fossil fuel infrastructure for data centers while simultaneously rolling back pollution regulations and stalling renewable energy projects.

The US is now planning to build more fossil fuel capacity than it has in a decade, according to a separate report published this month by the Environmental Defense Fund.