Regardless of our background and the subjects we teach, if we want to implement Education for Sustainable Development (ESD), we need to have a good foundation of environmental knowledge. In other words, we need to become ecologically literate. This includes having a clear understanding of different environmental terms and concepts, such as biodiversity and our Earth’s climate system. This gives us the basis that we need to learn about the causes, impacts and solutions to the environmental crisis, which is an interconnected, multi-dimensional wicked problem on a global scale. Lastly, we can focus on exploring climate change, land-use change, pollution, water scarcity and biodiversity loss from a local perspective.