There's been five years of legal and political wrangling since that bill was signed, but in a nutshell: Federal law gives California a power other states don't have to regulate pollution. Since carbon dioxide from cars and trucks is a pollutant, California can control how much they emit -- and the only real way to limit CO2 from vehicles is through burning less gas. After several rounds of legal battles that went to the U.S. Supreme Court, automakers faced either letting California set its own fuel efficiency standards -- which could apply to about half of their sales -- or embracing federal rules that, while tough, would be less onerous and nationwide.
Federal officials estimate those new rules, contained in a 1,994-page document unveiled this week, will save 4 billion barrels of oil and 2 billion metric tons of CO2 over the 17-year lifespan of the vehicles they cover. To give you an idea of where we're headed, here's the rule's estimate of the fuel economy some popular models of cars and truck will need to meet in 2025 under the plan (these figures have been reduced by 20 percent to reflect real-world fuel economy rather than the laboratory numbers used in the rule).
|Model||2012 MPG||Est. 2025 MPG|
- Politics & Government
- Arnold Schwarzenegger
- fuel economy