- California and 18 other U.S. states have promised to fight a Trump administration proposal to weaken Obama-era fuel efficiency standards.
- A rollback would see a requirement to boost vehicles to 50 mpg by 2025 - slashed to 37 mpg - helping lower car prices for consumers, but critics say the plan would accelerate climate change and increase fuel costs.
- The proposal also opens new questions about the limits of federal powers over states.
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