The Τ4Τ Toolkit is educational material designed for the preparation of participating teachers in the T4T (Training for Trainers) seminars that ELIAMEP organizes every year within the framework of the ARSINOE project (Horizon 2020). It provides high school teachers with a) scientific evidence-based knowledge for mitigation and adaptation of climate change as well as b) the necessary empirical and theoretical tools to integrate the simulation techniques into the learning process.