The main objective of this eTwinning project is to create a collaboration framework between the educational centers integrated in the Erasmus + SOSOLVER consortium using the TwinSpace platform. SOSOLVER (Sustainability and green solutions) brings together teachers belonging to 10 educational centers in Fuenlabrada (Madrid), 6 centers for Infant and Primary Education and 4 for Secondary Education, coordinated by the Environmental Training Center "Villaviciosa de Odón Nature Workshop". SOSOLVER is a KA101 consortium aimed at teacher training on the subject of sustainability. Each center in Fuenlabrada is paired with another Danish center in the city of Middelfart. The SOSOLVER TwinSpace will also be the platform where students from Fuenlabrada schools and their Danish partners can interact and share their work.