The natural cycles of fauna and flora are being modified by climate change: flowers appear earlier, fruits must be harvested earlier and earlier, leaves fall later... Several citizen science projects in Catalonia seek to put numbers to these phenomena, which affect agricultural and forestry processes. The activity consists of an introductory explanation and a participatory walk through the natural environment, close to the urban center of Artés, a small village near Barcelona. Total duration 1.5 hours. In charge of the RitmeNatura Observatory of CREAF and the FenoCat network of the Meteorological Service of Catalonia (SMC).