The project One Planet, All Beings aims to empower young people to better understand the impact of their everyday choices on people, animals, and the environment, and to become active contributors to more sustainable and inclusive communities. Through local actions, international mobility, and youth-led initiatives, the project seeks to strengthen eco-empathy, critical thinking, and civic engagement among young people aged 15–20 in Lithuania and Bulgaria. The main objectives are to raise awareness about sustainability as a shared responsibility that includes environmental, social, and ethical dimensions; to support young people in developing greener habits and realistic local solutions; and to promote youth participation in dialogue with decision-makers. In addition, the project aims to enhance young people’s digital, communication, and leadership competences, while ensuring inclusion of youth with fewer opportunities and fostering cross-cultural cooperation at European level.