updated 7/31/2008 4:43:51 PM ET 2008-07-31T20:43:51

Five states led by California on Thursday gave notice of their intent to sue the U.S. Environmental Protection Agency if it does not act soon to reduce carbon emissions from ships, aircraft and off-road vehicles.

In a letter prepared by California Attorney General Jerry Brown, the five states and New York City accuse the Bush administration of ignoring their requests to set restrictions.

"It's a necessary pressure to get the job done," Brown said earlier. "The issue of reducing our energy dependence and greenhouse gas emissions is so challenging and so important that we have to follow this judicial pathway."

The threatened lawsuit comes as California is challenging the EPA in federal court over its decision last year to prohibit the state from imposing its own emission standards on vehicles.

The intent to sue is a procedural step required six months before filing a lawsuit. Connecticut, New Jersey, Oregon, the Pennsylvania Department of Environmental Protection and New York City joined California in the notice.

A coalition of environmental groups on Thursday also sent a notice of their own intent to sue the EPA.

Next administration different?
Both letters demand the EPA respond within 180 days, although the authors acknowledge that the timeframe extends to the next administration, which might view such regulations more favorably.

"The EPA should have been regulating these emissions a long time ago, and it's just been sitting around," said Martin Wagner, an attorney at Earthjustice, a nonprofit public interest law firm.

Domestic and international flights account for 3 percent of the country's greenhouse gas emissions. Tractors, snowmobiles, riding lawn mowers and off-road vehicles produced about 220 million tons of carbon dioxide in 2007, roughly the same amount as 40 million cars, according to the petitions.

Emissions from cargo and cruise ships account for 3 percent of global greenhouse gas emissions.

"There's only five countries that release more carbon annually than the global shipping fleet," said Jacqueline Savitz, a marine scientist at Oceana, an ocean conservation group. "The idea of not regulating the shipping fleet is like not regulating Japan."

The U.S., China, Russia, India and Japan are the world's five largest producers of carbon dioxide and other greenhouse gases.

The states want the EPA to require airlines to use more fuel-efficient aircraft, use cleaner fuels or build lighter, more aerodynamic airplanes. They say marine vessels also could use cleaner-burning fuels, travel at slower speeds and plug into land-based energy sources when docked at port.

Off-road vehicles could be required to comply with anti-idling standards, be equipped with automatic engine shut-off systems and built with lighter materials. Older engines would be replaced and hybrid technology could be used in new models.

Earlier petitions
California and environmental groups filed petitions in October asking the EPA to determine whether greenhouse gas emissions from marine vessels endanger public health and welfare. They were joined by the other states in December seeking a similar review for domestic and foreign aircraft.

In January, they also asked the EPA to consider regulating emissions from off-road vehicles.

In each case, the petitions argued that the federal government has an obligation to regulate greenhouse gas emissions as a pollutant under the Clean Air Act.

EPA spokesman Jonathan Shradar said the agency responded to the petitions when it released a document on July 11 asking the public to comment on whether it should regulate greenhouse gas emissions. In that document, however, the agency said the Clean Air Act is "ill-suited" for dealing with climate change.

"We believe we've been responsive," Shradar said. "The first step in any regulation is an open comment period."

The attorneys general for the five states and the environmentalists say the EPA's actions were insufficient.

"It's pathetic and evasive," Brown said. "While it does indicate many important facts, it in no way comes to a conclusion that significant action needs to be taken now."

The U.S. Supreme Court last year ruled that the EPA has the authority to regulate carbon dioxide and other greenhouse gases linked to climate change. The agency is not required to do so, however, if it can show that carbon dioxide emissions are not a danger to public health and welfare.

In December, the EPA blocked California and at least 16 other states from regulating greenhouse gas emissions from new cars and trucks. EPA administrator Stephen Johnson has said California's proposed emissions limits weren't needed because Congress passed energy legislation raising fuel-economy standards that achieve similar results.

California officials say the national fuel standards are not as stringent and appealed the decision in state and federal courts.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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