on 2019/07/17
Energías Alternativas.
https://www.youtube.com/watch?v=Iex2o8cCWbM&feature=youtu.be
https://www.youtube.com/watch?v=WWtRk-uwxAQ&feature=youtu.be
Producción de biogas, quitar elementos polucionadores.
https://www.youtube.com/watch?v=GP76H-8SeV0
https://www.youtube.com/watch?v=Ly6hQYXDMgM
https://www.youtube.com/watch?v=LQQSbpwV5r0
https://www.youtube.com/watch?v=7O8yucFacyQ
https://www.youtube.com/watch?v=GP76H-8SeV0