Talk on the future of food and energy, for 4th grade kids

Last 7th the coordinator of Instituto Resiliencia, Manuel Casal Lodeiro, had a talk to 4th grade kids (9-10 y.o.) at Ventín school in Ames (Galicia).
His talk was inspired by a didactic exercize by Pedro Prieto, and also on the concepto of energy slaves developed by Buckminster Fuller with use of panels from Stuart McMillen’s comic.