The Erasmus + project (KA 2) for 2015-2017 with the title is a multilateral partnership, involving three countries: Spain, Bulgaria and Germany. This is a common project, which will be run as a cross curricular project. 16-17 years-old students will work, in teams, on topics concerning sustainable development. During next school years, they will exchange their ideas by different ways of communication. At the beginning, everybody has to know the facts in the different regions and so, the groups will analyze the actual situation and present the results. The groups will have three actual ecological footprints with specific needs. This will be the point to begin to reflect situation and to understand which will be the ecologic challenges of our common future in Europe and the world. The relevant facts will be the basis of some propositions how to enhance the actual situation and especially, how every person can understand what he is doing and what are the consequences. Then the group has to act: To reach a maximum of persons we will develop an ecological food planner (digital), an ecological mobility planer and an interactive game. Regional stakeholders will be implicated and will help with their competence. The results will be published in different media and every person which is interested in the topics can have his personal experiences. The impact is to understand the context and to try to create a more responsible behavior concerning our environment.