FILE - This May 18, 2010 file photo shows National Oceanic and Atmospheric Administration (NOAA) Administrator Jane Lubchenco testifying on Capitol Hill in Washington. The White House says tackling climate change and enhancing energy security will be among President Barack Obama's top priorities in his second term. Obama will have to do that work with new heads of the agencies responsible for the environment. Interior Secretary Ken Salazar, Environmental Protection chief Lisa Jackson and Jane Lubchenco, head of the National Oceanic and Atmospheric Administration, all have announced they are leaving. Energy Secretary Steven Chu is expected to follow his colleagues out the door in coming weeks. (AP Photo/Manuel Balce Ceneta, File)

Associated Press
FILE - This May 18, 2010 file photo shows National Oceanic and Atmospheric Administration (NOAA) Administrator Jane Lubchenco testifying on Capitol Hill in Washington. The White House says tackling climate change and enhancing energy security will be among President Barack Obama's top priorities in his second term. Obama will have to do that work with new heads of the agencies responsible for the environment. Interior Secretary Ken Salazar, Environmental Protection chief Lisa Jackson and Jane Lubchenco, head of the National Oceanic and Atmospheric Administration, all have announced they are leaving. Energy Secretary Steven Chu is expected to follow his colleagues out the door in coming weeks. (AP Photo/Manuel Balce Ceneta, File)
FILE - This May 18, 2010 file photo shows National Oceanic and Atmospheric Administration (NOAA) Administrator Jane Lubchenco testifying on Capitol Hill in Washington. The White House says tackling climate change and enhancing energy security will be among President Barack Obama's top priorities in his second term. Obama will have to do that work with new heads of the agencies responsible for the environment. Interior Secretary Ken Salazar, Environmental Protection chief Lisa Jackson and Jane Lubchenco, head of the National Oceanic and Atmospheric Administration, all have announced they are leaving. Energy Secretary Steven Chu is expected to follow his colleagues out the door in coming weeks. (AP Photo/Manuel Balce Ceneta, File)