In a letter to Yellen viewed by Reuters, Democratic Senators Elizabeth Warren, Sheldon Whitehouse and Edward Markey criticized the work done by John Morton, Yellen's first climate counselor.
"Treasury has been central to delivering on the Biden Administration’s climate agenda," she said, when asked about the senators' letter.
In their letter, the senators also faulted Treasury's leadership of climate work by the Financial Stability Oversight Council, which identified climate change as an "emerging and increasing threat to U.S. financial stability" in October 2021.
The second Treasury official, who was not authorized to speak publicly, said the independent agencies grouped under FSOC were taking action, but those steps followed prescribed processes.
No Treasury climate counselor could speed up that work since the agencies were independent, the official said.