The Energy Department did not respond to a request for comment.

In May, President Trump released a budget for 2018 proposing the “elimination of climate change initiatives” within the Energy Department, including the international climate office. While the budget will require congressional approval, Mr. Perry has authority to reorganize parts of the Energy Department before lawmakers decide on spending levels.

The office is the only one in the Energy Department to have “climate” as part of its name.

The Trump administration has scaled back the federal government’s involvement on global warming on a number of fronts, scrubbing mentions of “climate change” from a variety of agency websites and unwinding climate regulations at the Environmental Protection Agency.

Closing the Office of International Climate and Technology could make cooperation on clean energy with other countries much harder, said Graham Pugh, who headed the office from 2011 to 2014. While both the State and Energy Departments still have separate programs to engage with China, Brazil and other countries, the office being eliminated specialized in applying the agency’s technical expertise to other nations’ efforts to advance clean energy projects.

The office played an important role, for instance, in helping India develop its own lighting efficiency standards and start a program to purchase LED lamps in bulk for consumers. “That program will lead to massive savings in terms of avoided carbon dioxide emissions and air pollution,” said Jonathan Elkind, who was an assistant secretary for the Energy Department’s Office of International Affairs during the Obama administration.