Electric and electronic devices are already a must during field work. They also allow to obtain environmental data with greater precision and quality, in an autonomous way, without the need of frequent field visits. For example, the automatic monitoring network deployed in the Doñana Biological Reserve (ICTS-RBD) records all kinds of environmental parameters. However, GPS, PDA, mobiles, sensors, cameras, recorders, dataloggers, etc. generate waste that requires responsible recycling. Participation in #Greenleague20 will allow us to learn how to manage electronic waste.