If you click this link, there's some interview footage with Josh talking about the 'Darfur Now" film. Apparent, he's also done a public service announcement for it. I applaude his desire to help--Darfur is a nightmare.
http://www.livevideo.com/video/HollywoodLive/7A7286C499A34216AD9663FAE07ECEDC/darfur-now-screening.aspx