Nathaniel Keohane, most recently the chief economist at the Environmental Defense Fund, has moved to the National Economic Council at the White House to help direct environmental and energy policy.
Mr. Keohane is a vigorous proponent of the market-based system of cap and trade to control greenhouse gas emissions.
The top job at the economic council is currently vacant; the former director, Lawrence H. Summers, resigned at the end of 2010. Carol M. Browner, the White House coordinator for energy and climate policy, is rumored to be moving to a new post, possibly deputy chief of staff.
Via Green, a blog about energy and the environment, at NYTimes.com.