California's plan for sharp cuts in automotive emissions of global warming gases could eventually lead much of the coastal United States to turn to vehicles that are substantially cleaner, and by extension more fuel efficient, than those in the rest of the nation. This year, New Jersey, Rhode Island and Connecticut have said they intend to start following California's car rules instead of Washington's. New York, Massachusetts, Vermont and Maine already do so. Together, these seven states, along with California, account for nearly 26 percent of the nation's auto market, according to R. L. Polk, a company that tracks auto registrations. Other states are also considering joining. One reason is that many states are now out of compliance on federal ozone emission regulations and see car tailpipes as a solution. Canada is also considering a similar approach on global warming. Automakers from Detroit to Tokyo are concerned that these states, and potentially Canada, could form a potent bloc that has more demanding regulations than the rest of the country.
"It would be a logistical and engineering challenge, and a costly problem," said Dave Barthmuss, a spokesman for General Motors. "It's more cost effective for us to have one set of emissions everywhere."
Many steps remain before all this happens. But this week, the first details of California's plan, which is still in its early stages, were made public. The plan would require automakers to cut global warming emissions from their new vehicles by 29.2 percent over the next decade, phasing in from the 2009 to the 2015 model years. California regulators are adamant that the plan is not a fuel economy measure because the federal government has authority over that issue.
"This agency is required by law to address air pollution that affects public health," said Jerry Martin, a spokesman for the California Air Resources Board. "We only adopt emissions regulations," he said, adding that the plan "was never intended" to be a fuel economy regulation.
http://www.nytimes.com/2004/06/11/business/11auto.html