The Obama climate move that nobody noticed

By David Roberts

The Obama administration just made a fairly significant move on climate change, and it flew right under the radar.

To explain, let me back up a bit.

How much damage does a ton of carbon emissions do? That dollar figure is known as the “social cost of carbon” and it is, as economist Frank Ackerman put it a few yeas ago, “the most important number you’ve never heard of.”