This paper aims to question, in comparative perspective with European experiences, whether free trade, and particularly continental economic integration in North America, impacts the economies, and leads to forms of transboundary governance. – The twenty‐first‐century globalizing economy and free trade regimes in Europe and North America transform regions and their economies. The authors wish to thank the Department of Architecture and Civil Engineering Laboratory at the Pontificia Universidad Javeriana for its support during the development of this research. The paper presents the main results of the research project "Construction with PET plastic bottles" developed by the Materials and Structures Research Group (GRIME) in conjunction with the Structures group of the Pontificia Universidad Javeriana. These results and analyses are presented in this paper. Pilot tests were also carried put for the mechanical behavior of walls made with earth-filled PET bottles subjected to loads perpendicular to the plane of the wall. Groups GRIME and Estructuras y Construcción of the Pontificia Universidad Javeriana, associated with Eco-Tec Soluciones, documented the constructive process and performed tests to evaluate the mechanical resistance to compression forces of earth-filled PET bottles. In order to try to solve both problems, since 2001 Eco-Tec Soluciones has pioneered in the construction of houses and water storage structures with PET bottles filled with rammed earth. Within this solid waste are plastics such as the PET bottles (for example soda bottles). Two of the main problems of mankind are the lack of housing and the accumulation of solid waste and garbage that ultimately brings environmental problems. We have responsibly sought a way to share our reflections and questions about the human future of cities, on the basisof our own experience and the future challenges we must face, because we have burning issues pending, so we are host10 ingthis new international dialogue to discuss a number of questions: How can we act now, so that by 2050 cities are known for their dignified, safe, peaceful life? How to narrow the gaps that are now growing ever-wider, deepening their great inequity? These issues now arise as the great challenges that our city shares with the rest of the world. Medellin has been the stage for reflections and multiple forms of resistance that have imbued the public and private sectors, the city and its citizens, with the custom of constant collaboration hinging upon respect for life, holistic human development and equity. Equity is the lighthouse beacon orienting our daily lives, as a collective purpose that will enable us to build a better society, in which all people will share in problem solving and also benefit from innovation, entrepreneurship, culture and civic awareness that are beginning to surface firmly as strengths and identity vis-à-vis the world.
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