January 29, 2006
Climate Expert Says NASA Tried to Silence Him
By ANDREW C. REVKIN
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," Mr. Acosta said. "We promote openness and we speak
with the facts."
He said the restrictions on Dr. Hansen applied to all National Aeronautics
and Space Administration personnel. He added that government scientists were
free to discuss scientific findings, but that policy statements should be
left to policy makers and appointed spokesmen.
Mr. Acosta said other reasons for requiring press officers to review
interview requests were to have an orderly flow of information out of a
sprawling agency and to avoid surprises. "This is not about any individual
or any issue like global warming," he said. "It's about coordination."
Dr. Hansen strongly disagreed with this characterization, saying such
procedures had already prevented the public from fully grasping recent
findings about climate change that point to risks ahead.
"Communicating with the public seems to be essential," he said, "because
public concern is probably the only thing capable of overcoming the special
interests that have obfuscated the topic."
Dr. Hansen, 63, a physicist who joined the space agency in 1967, directs
efforts to simulate the global climate on computers at the Goddard Institute
in 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
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
He said he was particularly incensed that the directives had come through
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
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.
Mr. Acosta said the calls and meetings with Goddard press officers were not
to introduce restrictions, but to review existing rules. He said Dr. Hansen
had continued to speak frequently with the news media.
But Dr. Hansen and some of his colleagues said interviews were canceled as a
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
Normally, Ms. McCarthy would not be free to describe such conversations to
the news media, but she agreed to an interview after Mr. Acosta, at NASA
headquarters, told The Times that she would not face any retribution for
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 in 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
"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
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
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
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 identified the
views as his own.
"One reason why I still continue to do the extracurricular stuff," he wrote,
"is because one doesn't have to get clearance for what I plan on saying or