3CR Radio: Earth Matters 11.01.2015 It’s an old idea, but a good one: turning large parts of Australia’s agricultural land into tree crops, and supplementing grain fields with tree crops as well. Veteran permaculture practitioners and educators David Holmgren, Darren Doherty and Byron Joel share their thoughts … Continue reading David Holmgren, Darren Doherty and Byron Joel on Earth Matters