The SUSTAIN project contributes to the challenges, cities and regions throughout Europe face by developing education innovation that surpasses school boundaries and rigid curricula. The project develops innovative, state-of-the-art learning practices to empower pupils and teachers to engage with real-life challenges: challenges that require them to think for themselves, step out of the classroom and connect to professional networks that serve sustainable development in their region. The project strives to: • Spark dialogues on sustainable landscapes between secondary schools, universities and other educational providers, to articulate a sense of urgency for regional sustainable development goals; • Champion the importance of regional bottom-up so-called STEM learning ecosystems to formal and informal education providers, identify key actors and set a shared regional science education agenda, • Deeply engage pupils and their caregivers in three countries with hands-on citizen science work, thus stimulating critical thinking and raising interest in STEM learning and work; • Equip school teachers with the skills to bring together formal and informal learning for citizen science, through a comprehensive professional development programme; • Commit to incremental growth in the excellence of the above initiatives and networks, and build capacity to improve science education through a tailored evaluation, monitoring and peer-learning programme; • Identify good online and offline practices on science education and/or citizen science and disseminate them at regional, national and international scales. Twelve partners, being four universities, six schools, one local stakeholder together with European Science Engagement networks, formed together the SUSTAIN consortium. This consortium actively built STEM learning ecosystems on sustainable landscapes, both at the European level as regionally in the three countries (Spain, Cyprus, and the Netherlands). These interdisciplinary ecosystems consist of secondary school teachers, scientists working in the field of sustainable landscapes, and providers of science education and communication. Geographically, the project has a pan-European perspective, with a regional focus on the Northern Netherlands, the region of Valencia, Spain and Cyprus. Together, the consortium developed three online modules that increase awareness of the urgency to contribute to the local environment. Each module focuses on a specific topic, such as biodiversity and food web structure, water management and bird migration. All modules are based on a regional challenge, such as decreasing meadow bird population (Netherlands), falling water levels (Spain) and illegal bird trapping for consumption (Cyprus). Included in the three online modules are materials on academic skills to foster critical thinking (as essential 21st century skills) by secondary school pupils, and webinars to support the teachers while running the modules. With these modules, pupils learn to analyse complex social relevant topics as sustainable landscapes, develop a critical attitude and form their own opinions. In addition, they met role models and learned to appreciate the role of science in society. Based on their experience, the consortium wrote a roadmap on setting up a STEM learning ecosystem on sustainable landscapes. The consortium, together with the NUCLEUS project and members of the EUSEA network, co-created an online platform that showcases a number of recommended formats of activities designed to encourage participatory science engagement, showing a range of possibilities and some practical examples, which can be implemented by teachers across Europe. The platform also offers an overview of valuable toolkits and good reads related to science communication and public engagement. This platform turns out to be a lively and active platform that will keep on developing - both with off- and online interactive formats.