The US has been?

- U.S. greenhouse gas emissions peaked around 2007, then declined by roughly 18% from that peak.

- 1990–2022: Emissions fell about 3% compared to 1990 levels, despite population and GDP growth.

- 2005 Benchmark: Emissions in 2022 were 17% below 2005 levels, largely due to cleaner electricity generation and efficiency improvements.

- Transportation: Consistently the largest source, accounting for ~30–35% of CO₂ emissions.

- Electric Power: Significant reductions—down 41% since 2005—due to coal-to-natural-gas shift and renewables growth.

- 2024: Energy-related CO₂ emissions totaled 4,772 million metric tons, down from 4,940 MMt in 2022.

- 2022: Total U.S. GHG emissions were 6,343 million metric tons CO₂e, or 5,489 MMt after land-sector sequestration