The aggressive fuel-economy regulations the Biden administration rolled out last week are intended to spur faster development of electric cars, but they rely on a credit program that some environmentalists say undercuts the program's pollution-fighting purpose.
The system allows carmakers to claim an equivalent of more than 100 miles per gallon for each EV in their lineup, potentially allowing them to meet the 49 mpg fleetwide mandate by 2026 even if the rest of the lineup is crowded with internal combustion vehicles.
"Automakers have delighted in a system that allows them to evade the rules with generous credits they can buy from other companies or create themselves that allows them to avoid meeting stricter requirements," said Dan Becker, director of the Center for Biological Diversity's Safe Climate Transport Campaign.
Under the updated regulations, carmakers will be required to raise the average fuel efficiency of their fleets 8 percent annually for …