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The government's top public health agency has canceled a conference next month on climate change and health but isn't saying why publicly.

But a co-sponsor was told by the Centers for Disease and Prevention that the agency was worried how the conference would be viewed by the Trump administration.

FILE - In this July 26, 2011 file photo, drops of water fall from a melting iceberg near Nuuk, Greenland. AP

The incoming administration did not ask or order that the meeting be canceled, said Dr. Georges Benjamin, executive director of the American Public Health Association.

"They had no idea whether the new administration would be supportive," said Benjamin, whose group was a co-sponsor of the event with the CDC.

"They had no idea whether the new administration would be supportive."

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Rather, the decision was "a strategic retreat," intended to head off a possible last minute cancellation or other repercussions from Trump officials who may prove hostile to spending money on climate change science, Benjamin said Monday.

Related: Obama Caps Legacy With Paris Climate Change Deal

"They decided the better part of valor was to stop and regroup" until it could be discussed with Trump's new health leadership, Benjamin said. A new CDC director has not been named.

Benjamin called the decision understandable but worrisome. He was echoed by Kristie Ebi, a professor of global health at the University of Washington in Seattle, who was invited to speak at the conference.

"In the long run, climate change is affecting the health of Americans," she said. "At some point, I hope they will go forward with the conference."

Related: White House Says Climate Change is Ruining Health

A CDC official confirmed the agency's decision last month to cancel the Climate and Health Summit scheduled for Feb. 14-17 but offered no explanation when asked. In a statement to those registered, the CDC said the summit may take place later in the year.

Public health experts say climate change is a human-made problem that contributes to a range of health issues and illnesses, including heat stroke and diseases spread by tropical insects. The CDC has a $10 million program on climate and health, and published guidelines to help local health officials deal with human vulnerability to climate change.

Related: Is Global Warming Making us Sick?

In 2012, Trump tweeted that the concept of global warming was created by the Chinese to make U.S. manufacturing non-competitive. He later said he was joking, but during the presidential campaign referred to global warming as "a hoax."

Before he took office, Trump met with former Vice President Al Gore and Leonardo DiCaprio, both prominent climate activists. Trump picked Oklahoma Attorney General Scott Pruitt, as head of the Environmental Protection Agency. During his confirmation hearing, Pruitt backed away from his own past statements and said climate change is real.