ANNAPOLIS (AP) - Gov. Martin O'Malley is preparing to back a sweeping plan to confront global warming through a state carbon cap, administration and environmental officials said yesterday.

Mr. O'Malley, a Democrat who has said he wants to be a leader in dealing with sea-level rise, planned an announcement today to back a bill that would set the nation's toughest limits on carbon emissions - a 90 percent drop from 2006 levels by 2050. The bill would require a 25 percent drop by 2020.

Mr. O'Malley planned to suggest changes to the bill, and those changes weren't made public in advance of his announcement, but people with knowledge of the governor's plans said the main points of the global warming bill would get his backing.

"The spirit is upheld, absolutely," said Brad Heavner, director of Environment Maryland, who has been in talks with the administration on the global-warming bill.

The governor's announcement was planned as a Senate committee prepares to take up the global warming bill Thursday. More than 200 environmental activists met in Annapolis yesterday to learn about the global-warming bill and three other proposals backed by environmental groups.

The other three - a plan to spend a $50 million Chesapeake Bay fund, an energy efficiency measure and a reform to state zoning laws that apply to development near waterways - already have the administration's support.

Mr. O'Malley convened a task force last year to study global warming and recommend ways Maryland, with more than 3,000 miles of coastline, could address climate change. The task force tentatively has proposed the nation's toughest carbon cap, but its report is not yet final. New Jersey, California and Florida have set goals of reducing carbon emissions 80 percent by 2050.

John Griffin, head of the Department of Natural Resources, said global warming poses a significant risk to the state's outdoors and the Chesapeake Bay.

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