In 2020, California's carbon intensity was 57.9 percent lower than that of the rest of the U.S. Compared to 2019, California's carbon intensity dropped 12.9 percent, while that of the rest of the nation also decreased by 7.4 percent. California's experienced the second-most significant decline in carbon intensity compared to other large states, behind Massachusetts (-14.3%). Illinois came close with a 12 percent drop, followed by New York (-10.7%), Florida (-8.5%) and Pennsylvania (-7.5%). While all other states' carbon intensity saw a modest drop during 2020, the declines in Texas (-6.0%) and Ohio (-2.2%) were slower than the national average.
Among the 50 states (excluding the District of Columbia), California maintained its position as the third-most carbon-efficient state (0.101 MTCO2e relative to inflation-adjusted GDP) in 2020, behind New York (0.083 MTCO2e/$1,000) and Massachusetts (0.089 MTCO2e/$1,000).