Wonder of the last 1/2 century

I was going to post this on the wonder of the day thread, but so many video links there it keeps freezing my computer. It's ok though. As Monbiot says, "One of the most exciting discoveries of the past 1/2 century has been the discovery of widespread trophic cascades." So maybe this deserves its own thread anyway. Especially since the biomimicry that we use in permaculture as a template for agriculture is based on those same trophic cascades found in nature. Study them wisely as Bill Mollison teaches and you have your model!