The top climate scientist at NASA says the Bush administration has tried to stop him from speaking out since he gave a lecture last month calling for prompt reductions in emissions of greenhouse gases linked to global warming.

The scientist, James E. Hansen, longtime director of the agency's Goddard Institute for Space Studies, said in an interview that officials at NASA headquarters had ordered the public affairs staff to review his coming lectures, papers, postings on the Goddard Web site and requests for interviews from journalists.

Dr. Hansen said he would ignore the restrictions. "They feel their job is to be this censor of information going out to the public," he said.

Dean Acosta, deputy assistant administrator for public affairs at the space agency, said there was no effort to silence Dr. Hansen. "That's not the way we operate here at NASA," he said. "We promote openness and we speak with the facts."

Mr. Acosta said the restrictions on Dr. Hansen applied to all National Aeronautics and Space Administration personnel whom the public could perceive as speaking for the agency. He added that government scientists were free to discuss scientific findings, but that policy statements should be left to policy makers and appointed spokesmen.

Dr. Hansen, 63, a physicist who joined the space agency in 1967, is a leading authority on the earth's climate system. He directs efforts to simulate the global climate on computers at the Goddard Institute on Morningside Heights in Manhattan.

Since 1988, he has been issuing public warnings about the long-term threat from heat-trapping emissions, dominated by carbon dioxide, that are an unavoidable byproduct of burning coal, oil and other fossil fuels. He has had run-ins with politicians or their appointees in various administrations, including budget watchers in the first Bush administration and Vice President Al Gore.

In 2001, Dr. Hansen was invited twice to brief Vice President Dick Cheney and other cabinet members on climate change. White House officials were interested in his findings showing that cleaning up soot, which also warms the atmosphere, was an effective and far easier first step than curbing carbon dioxide.

He fell out of favor with the White House in 2004 after giving a speech at the University of Iowa before the presidential election, in which he complained that government climate scientists were being muzzled, and said he planned to vote for Senator John Kerry.

But Dr. Hansen said that nothing in 30 years equaled the push made since early December to keep him from publicly discussing what he says are clear-cut dangers from further delay in curbing carbon dioxide.

In several interviews with The New York Times in recent days, Dr. Hansen said it would be irresponsible not to speak out, particularly because NASA's mission statement includes the phrase "to understand and protect our home planet."

He said he was particularly incensed that the directives affecting his statements had come through informal telephone conversations and not through formal channels, leaving no significant trails of documents.

Dr. Hansen's supervisor, Franco Einaudi, said there had been no official "order or pressure to say shut Jim up." But Dr. Einaudi added, "That doesn't mean I like this kind of pressure being applied."

The fresh efforts to quiet him, Dr. Hansen said, began in a series of calls after a lecture he gave on Dec. 6 at the annual meeting of the American Geophysical Union in San Francisco. In the talk, he said that significant emission cuts could be achieved with existing technologies, particularly in the case of motor vehicles, and that without leadership by the United States, climate change would eventually leave the earth "a different planet." The administration's policy is to use voluntary measures to slow, but not reverse, the growth of emissions.

After that speech and the release of data by Dr. Hansen on Dec. 15 showing that 2005 was probably the warmest year in at least a century, officials at the headquarters of the space agency repeatedly phoned public affairs officers, who relayed the warning to Dr. Hansen that there would be "dire consequences" if such statements continued, those officers and Dr. Hansen said in interviews.

Among the restrictions, according to Dr. Hansen and an internal draft memorandum he provided to The Times, was that his supervisors could stand in for him in any news media interviews.

In one call, George Deutsch, a recently appointed public affairs officer at NASA headquarters, rejected a request from a producer at National Public Radio to interview Dr. Hansen, said Leslie McCarthy, a public affairs officer responsible for the Goddard Institute.

Citing handwritten notes taken during the conversation, Ms. McCarthy said Mr. Deutsch called N.P.R. "the most liberal" media outlet in the country. She said that in that call and others Mr. Deutsch said his job was "to make the president look good" and that as a White House appointee that might be Mr. Deutsch's priority.

But she added: "I'm a career civil servant and Jim Hansen is a scientist. That's not our job. That's not our mission. The inference was that Hansen was disloyal." Normally, Ms. McCarthy would not be free to describe such conversations to the news media, but she agreed to an interview after Mr. Acosta, in NASA headquarters, told The Times that she would not face any retribution for doing so.

Mr. Acosta, Mr. Deutsch's supervisor, said that when Mr. Deutsch was asked about the conversations he flatly denied saying anything of the sort. Mr. Deutsch referred all interview requests to Mr. Acosta.

Ms. McCarthy, when told of the response, said: "Why am I going to go out of my way to make this up and back up Jim Hansen? I don't have a dog is this race. And what does Hansen have to gain?"

Mr. Acosta said that for the moment he had no way of judging who was telling the truth. Several colleagues of both Ms. McCarthy and Dr. Hansen said Ms. McCarthy's statements were consistent with what she told them when the conversations occurred.

"He's not trying to create a war over this," said Larry D. Travis, an astronomer who is Dr. Hansen's deputy at Goddard, "but really feels very strongly that this is an obligation we have as federal scientists, to inform the public, and this kind of attempted muzzling of the science community is really rather dangerous. If we just accept it, then we're contributing to the problem."

Dr. Travis said he walked into Ms. McCarthy's office in mid-December at the end of one of the calls from Mr. Deutsch demanding that Dr. Hansen be better controlled.

In an interview on Friday, Ralph J. Cicerone, an atmospheric chemist and the president of the National Academy of Sciences, the nation's leading independent scientific body, praised Dr. Hansen's scientific contributions and said he had always seemed to describe his public statements clearly as his personal views.

"He really is one of the most productive and creative scientists in the world," Dr. Cicerone said. "I've heard Hansen speak many times and I've read many of his papers, starting in the late 70's. Every single time, in writing or when I've heard him speak, he's always clear that he's speaking for himself, not for NASA or the administration, whichever administration it's been."

The fight between Dr. Hansen and administration officials echoes other recent disputes. At climate laboratories of the National Oceanic and Atmospheric Administration, for example, many scientists who routinely took calls from reporters five years ago can now do so only if the interview is approved by administration officials in Washington, and then only if a public affairs officer is present or on the phone.

Where scientists' points of view on climate policy align with those of the administration, however, there are few signs of restrictions on extracurricular lectures or writing.

One example is Indur M. Goklany, assistant director of science and technology policy in the policy office of the Interior Department. For years, Dr. Goklany, an electrical engineer by training, has written in papers and books that it may be better not to force cuts in greenhouse gases because the added prosperity from unfettered economic activity would allow countries to exploit benefits of warming and adapt to problems.

In an e-mail exchange on Friday, Dr. Goklany said that in the Clinton administration he was shifted to nonclimate-related work, but added that he had never had to stop his outside writing, as long as he identifies the views as his own.

"One reason why I still continue to do the extracurricular stuff is because one doesn't have to get clearance for what I plan on saying or writing," he wrote.

Many people who work with Dr. Hansen said that politics was not a factor in his dispute with the Bush administration.

"The thing that has always struck me about him is I don't think he's political at all," said Mark R. Hess, director of public affairs for the Goddard Space Flight Center in Greenbelt, Md., a position that also covers the Goddard Institute in New York.

"He really is not about concerning himself with whose administration is in charge, whether it's Republicans, Democrats or whatever," Mr. Hess said. "He's a pretty down-the-road conservative independent-minded person.

"What he cares deeply about is being a scientist, his research, and I think he feels a true obligation to be able to talk about that in whatever fora are offered to him."