With just three months left before he leaves office, Federal Reserve Chairman Alan Greenspan (search) raised a warning to Congress: The country could face "serious economic disruptions" if bloated budget deficits are not curbed.

The Fed chief's strong comments, made during an appearance Thursday before Congress' Joint Economic Committee, come after the government produced a $319 billion budget deficit (search) this year — an improvement from the record amount of red ink registered in 2004 but still the third-highest deficit on record.

In the short term, costs related to rebuilding after the trio of devastating hurricanes will make it harder to improve the nation's balance sheets, he acknowledged. In the long term, a huge wave of retiring baby boomers will put massive strains on government resources, he said.

"There are no easy choices. Easy choices are long gone," said Greenspan, whose 18-plus year run at the Fed comes to an end on Jan. 31.

Congress is working on separate packages of tax cuts and spending cuts.

Even as he sounded an alarm about the dangers that budget deficits pose to the country's long-term health, Greenspan struck a more positive note about the economy's current prospects after being jolted by the recent hurricanes.

Katrina, Rita and Wilma (search) are likely to "exert a drag" on employment and production in the short term and may aggravate inflation pressures, Greenspan said. "But the economic fundamentals remain firm, and the U.S. economy appears to retain important forward momentum," Greenspan said in his most extensive remarks thus far on the impact of the storms.

The Fed is keeping a close eye on high energy prices to make sure they don't spark broader inflation.

"We are very firm in the notion that this country should not visit the 1970s again in the way of inflation," Greenspan said, referring to a period where the economy was rocked by skyrocketing prices.

On the budget front, Greenspan called on Congress to get the nation's fiscal house in order and bring the swollen deficits under control.

"Unless the situation is reversed, at some point, these budget trends will cause serious economic disruptions," he said.

Persistently large deficits will eventually push up interest rates, Greenspan said. Higher borrowing costs would weigh on the willingness of consumers and businesses to spend and invest and that could be a drag on economic growth, analysts say.

"I find it utterly inconceivable, frankly," that persistent budget deficits over the long run "will not have a significant impact on long-term interest rates," he said.

Greenspan repeated his call for lawmakers to restore caps on spending. And, he urged lawmakers to pay for any future tax cuts with either increases in other taxes or reductions in spending. Greenspan said he'd like to see the dividend tax cut extended — but only it is paid for.

"Crafting a budget strategy that meets the nation's longer-run needs will become ever more difficult and costly the more we delay," he said.

The Fed chief also underscored his belief that benefits currently promised to the baby boom generation through Social Security and Medicare (search) likely cannot be met and probably will have to be trimmed.

"We owe it to those who will retire over the next couple of decades to promise only what the government can deliver," Greenspan said.

Greenspan was questioned about the support he gave in 2001 to President Bush's successful drive to get Congress to pass sweeping tax cuts that totaled $1.3 billion over 10 years. Those tax cuts are blamed by Democrats for bringing back record deficits.

"Do you have any regret about the way you expressed yourself in 2001?" asked Rep. Carolyn Maloney, D-N.Y.

Given the facts known at the time, Greenspan said he would still support the tax cuts because of projections, which later proved wrong, that the federal government was facing huge surpluses.

The Fed chief's appearance on Capitol Hill comes two days after the central bank boosted a key interest rate up to its highest level in more than four years to thwart inflation.

Oil prices briefly shot up past $70 a barrel in late August, and gasoline prices topped $3 a gallon before moderating. But home heating costs are expected to be much higher this winter than a year ago.

"I think people are going to be quite surprised at their heating bills this winter," Greenspan said.

Many economists are predicting the Fed will bump up rates at its next session, on Dec. 13, as well as on Jan. 31, which will be Greenspan's last meeting. Some analysts also are calling for a rate increase on March 28, which would be the first presided over by Ben Bernanke, President Bush's choice to replace Greenspan.

Lawmakers hailed Greenspan's economic stewardship

"You've done one heck of a job. And I think we're going to miss you a great deal," said Rep. Maurice Hinchey, D-N.Y.

"The nation is in your debt," said the committee's chairman, Rep. Jim Saxton, R-N.J.