Welcome aboard Air Force One as we make our way north to Northern California, San Francisco, before we go to Denver.

WHITEHOUSE: The White House

Some of Mr Bush's officials are known to believe that the opening up of North Korea in recent months has been via a one-way street, with all the concessions going to Pyongyang.

ECONOMIST: Bush's Korean scepticism | The

One way to change this would be to turn the east-west gas pipelines into a grid, with interconnectors running north to south.

ECONOMIST: Energy security in Europe