This report highlights notable trends in energy-related carbon dioxide (CO2) emissions in the United States in 2024, based on preliminary data. U.S. energy-related CO2 emissions declined overall by less than 1%, or 23 million metric tons (MMmt), in 2024. Among end-use sectors, the most notable decreases occurred in the residential and industrial sectors. Lower residential sector emissions were mostly due to decreases in consumption of natural gas and petroleum products primarily associated with space heating—mainly propane and distillate fuel oil. Decreases in industrial-sector emissions were associated with reduced manufacturing. Emissions from the commercial, transportation, and electric power sectors remained relatively unchanged but are discussed in greater detail in later sections.