The investigative arm of Congress is going to look into how the Obama administration developed its increased monetary estimate for the amount of damage caused by carbon pollution.

The Government Accountability Office (GAO) has agreed to a request from three Republican lawmakers to look into the way that the administration came up with the metric, which is used to calculate the benefits to the public from new regulations curbing carbon emissions.

Critics on both sides of the aisle have worried that the value was developed behind closed doors, without sufficient oversight and input from the public.