In 1970 a group of concerned citizens decided to send a ship to bear witness to underground nuclear bomb testing in the Aleutians (Amchitka). To raise funds they organized a benefit concert.
This concert launched Greenpeace. The CD from this concert is available http://www.amchitka-concert.com
A bit more on The Amchitka underground nuke situation —
Extra bonus MUSIC: Joni with Crosby Stills Nash & Young – Wembley 1974