Endgame
It could be that the author/environmental activist, Derrick Jensen, is new to you or maybe you're familiar with his work. Either way, I'd like to share some links to his material.
He impresses me with his straight-forward, logical approach and softly-spoken words. And so, here are a few ways you can get your dose of Derrick...
Read his book, Endgame or his other books. Here's his website: http://www.derrickjensen.org/
Watch the video, Endgame (below) or the Derrick Jensen vids on Youtube