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Module 2 builds on what you learned in the previous module, as we take a more in depth look at planetary boundaries and the key data supporting our current understanding of planetary health. Climate change is not the only issue we are facing, and in lesson two, we investigate the broad range of environmental issues caused by humans and the resulting human health impacts of these disruptions. In lesson three, we take a look at the 12 cross-cutting principles of planetary health education which define the guiding themes and values of the emerging field. These principles provide a foundation for the growing interest and efforts in the field. We wrap up this module by looking at sources of planetary health knowledge, as we begin to reflect on how we can all take action in improving planetary health.