Water, Waste Material, and Energy as Key Dimensions of Sustainable Management of Early Childhood Eco-Schools: An Environmental Literacy Model Based on Teachers Action-Competencies (ELTAC) López Alcarria, Abigail Poza Vilches, María De Fátima Pozo Llorente, María Teresa Gutiérrez Pérez, José Education for sustainability Curricular innovation Sustainability management Teacher training Action research Water Waste material Energy Eco-school Early childhood education The main argument defended in this article is that the involvement of teachers in decisionmaking about environmental aspects related to the management of educational institutions constitutes a powerful tool for training, teacher professional development, and environmental literacies. A group of early childhood education teachers across various institutions work under a collaborative action-research model for an entire year that is focussed on the following: (1) the institution’s water, solid waste, and energy management; (2) the planning of innovative activities related to water, solid waste, and energy, and; (3) participation in transformative actions that involve families and impact their neighbourhoods. The experience enables the building of a theoretical model of teacher training aimed at acquiring action skills from a comprehensive perspective of triple helix environmental literacy (management, research/innovation, and teaching) that affects their commitments to the management of environmental resources, the eco-auditing of their eco-school, the curricular greening of activities, the renewal of educational programs, and the implementation of an action-research focussed on aspects related to sustainability. 2021-03-02T09:49:57Z 2021-03-02T09:49:57Z 2021 journal article López-Alcarria, A.; Poza-Vilches, M.F.; Pozo-Llorente, M.T.; Gutiérrez-Pérez, J. Water, Waste Material, and Energy as Key Dimensions of Sustainable Management of Early Childhood Eco-Schools: An Environmental Literacy Model Based on Teachers Action-Competencies (ELTAC). Water 2021, 13, 145. https://doi.org/ 10.3390/w13020145 http://hdl.handle.net/10481/66768 10.3390/w13020145 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España MDPI