A once-obscure climate policy metric is increasingly becoming the stuff of administrative, lobbying and legislative battles.

Critics of the Obama administration’s increase in the “social cost of carbon” (SCC) estimate have recently found more venues to press for more “transparency” and for ending use of the metric for now.

The SCC is an estimate of the monetary damage from carbon pollution, such as changes in agricultural productivity, human health effects and increased sea-levels and flood risk.

Some recent action:

• In new comments to the Energy Department this week, the National Federation of Independent Business urged the department to grant a conservative legal group’s petition to re-do a microwave oven efficiency rule that first used the increased SCC estimate.