Home (the documentary) soundtrack has 1 track missing

Home, an inspiring documentary, also has a beautiful soundtrack. Yet probably the most moving of it's tracks is not in the official soundtrack. In the documentary is the one that runs when Glenn Close starts talking about man discovering agriculture (just a few seconds before minute 21 on the english youtube release).

Does anybody know where to find this track?

Thank you!

David

davidba25, September 23, 2010; 1:59 AM