His former office, which researches topics such as air pollution and chemical testing, has lost 250 scientists and staff members since Trump first took office while hiring 124. Those who remained in the office of about 1,500 people continue to do their jobs. Kavlock said, but is not working hard to promote breakthroughs on topics such as climate change.
"You can see they are trying not to shake their feathers," Kavlock said.
The same cannot be said of Patrick Gonzalez, the National Park Service's chief climate change scientist, whose job involves helping national parks protect themselves from damage caused by rising temperatures.
In February, Dr. Gonzalez testified before Congress about the risks of global warming, saying he was speaking as an adjunct professor at the University of California, Berkeley. He is also using his Berkeley affiliation to co-author a forthcoming report by the Intergovernmental Panel on Climate Change, a United Nations body that synthesizes climate science for world leaders.
But in March, shortly after testifying, Gonzalez's supervisor at the National Park Service sent the letter of cessation and withdrawal warning him that his Berkeley affiliation was not separate from government work and that his actions were violating agency policy. . Gonzalez said he saw the letter as an attempt to stop him from speaking.
The Interior Department, asked for comment, said the letter did not indicate an intention to sanction Dr. Gonzalez and that he was free to speak as a private citizen.
Gonzalez, with Berkeley's support, continues to warn of the dangers of climate change and to work with the United Nations vacation climate panel, and spoke to Congress again in June. "I would like to set a positive example for other scientists," he said.
Still, he noted that not everyone may be in a position to be equally sincere. "How many others aren't talking?" Said Gonzalez.