"Song for the Earth Liberation Front" by David Rovics (folk) - CC BY-NC-SA - Website
"Earth Crisis" by Venesection (metal) - CC BY-NC-SA - Website
These guys appear to have removed things from Jamendo and Ubuntu Satanic doesn't know about it. Currently their website is down (and I'm guessing won't be back up based on their MySpace), so you only get a link to YouTube, though you can listen to the song on MySpace as well if you like. Let me know if you want it and I can toss it your way. There are also various torrents that purport to have it.
"Earthmover" by Lee Rosevere (ambient) - Public Domain - Website
Another goofy situation. The album I got this from is licensed -NC-ND on archive.org. However, the video is under Public Domain...which of course has the audio.
"Not to Touch the Earth" by Modey Lemon - CC BY-NC-SA - Website
"Green Leaves" by Emcee Lynx (hip-hop) - CC BY-NC-SA - Website