The concepts of peace and peacebuilding were basically developed by men, often with a realist background. This top-down approach has people as simple spectators. Only an engendered-sustainable peace will be able to deal with the present global environmental and climate change. "Engendered-sustainable peace" refers to the structural factors related to long-term violence, deeply embedded in the patriarchal system and characterized by authoritarianism, discrimination, exploitation, destruction, and violence. I define and address the cosmopolitan concept of "engendered-sustainable peace" and examine its foundations in theories of positive, structural, cultural, and sustainable peace. I then address power relations from realism to cosmopolitanism, including historical materialism and feminist understandings. I then discuss the potential of technology for peacebuilding and examine how a transition toward an "engendered-sustainable peace" opens an analytical tool that could be used by bottom-up efforts to overcome the present violence against women, men, children, and elders, including the environment and ecosystem services.