In a surprising turn from previous years' reductions, the United States experienced a 2.4% increase in greenhouse gas emissions from fossil fuel combustion in 2025 compared to the previous year, as revealed by newly released research. Various factors contributed to this rise, including a colder winter that heightened energy demands, an explosive growth of data centers and cryptocurrency mining, and higher natural gas prices. Despite environmental policy shifts under the Trump administration, these changes were not significant enough in 2025 to account for this increase. Traditionally, US emissions have fallen alongside economic growth, yet the last year's data shows a divergence where emissions rose even with economic activity.