What is this piece of music?

I noticed this piece in promotions for the new Ken Burns film about the National Parks. I absolutely love it and could not identify it myself.

http://www.youtube.com/watch?v=eJx7t7ECutQ

It sure sounds like a sound track specifically composed for the video. It has that almost generic film score sound, and I doubt if they edited the video to fit an existing piece.

That means you will have to scan the credits to see who did the music, or if it is an extant score they have tacked into the sound track.

best regards, p.b.