This document discusses various DIY and citizen science projects related to sustainability and the ecological transition. It introduces projects like the Air Quality Egg and NoxDroid for citizen sensing of air quality, as well as the Trash Tracker for monitoring waste. Other discussed projects include Smart Citizen, open source projects like Open Energy Monitor, and the POC21 initiative which highlights post-COP21 citizen projects. The talk aims to promote participatory green projects and discuss sustainability approaches at Maker Faire Bilbao 2015.