In order to make the environmental impact of livestock known and, particularly, methane emission as a greenhouse gas, we worked along three years with students from five elementary schools in rural areas of Tandil. The process consisted in preparatory works with teachers as a start point, then the topic presentation to the students, a visit to the University Campus and, finally, a grupal board game to discuss and consolidate contents. A change was achieved in children´s perception about the possibility that cattle affects the environment, on possible causes of climate change and in the need to think strategies for adaptation and mitigation in livestock systems.