By Ben Stallings | Wed, 04/16/2014 - 22:00 I've been asked to give six 20-minute talks to middle-school students tomorrow on the topic of "Sustainability." I decided not to pull any punches! See the presentation here: https://prezi.com/onnnfjxpltdv/sustainability/ Etiquetas permaculture sustainability Classes Inicie sesión para enviar comentarios