Global transportation sector CO₂ emissions 2022, by country

The United States is the biggest contributor to global transportation emissions by far. In 2022, the U.S. transportation sector released 1.72 billion metric tons of carbon dioxide (GtCO₂) into the atmosphere. This was roughly 850 MtCO₂ more than the second-largest contributor China. In the year 2000, U.S transportation emissions totaled 1.7 GtCO₂, compared with 248 MtCO₂ in China. However, over the past two decades, China's transportation emissions have increased four-fold