An international planetary health for primary care massive open online course.

In this Viewpoint we argue that primary care practitioners should receive professional education in how to directly respond to planetary health challenges. We reflect on the provision of a massive open online course (MOOC) on planetary health for primary care practitioners in the context of existing training programmes. We describe the construction, delivery, and certification of a Global South-originated MOOC and explain aspects of its rhizomatic learning theory. We share baseline information and preliminary findings collected on the initial cohort of participants, including their profiles and previous knowledge about planetary health. We suggest that this MOOC is an appropriate response to planetary health challenges, and argue that cost-free, accredited planetary health education for primary care practitioners should be provided as a public good that also fulfils individual professionals' entitlement to quality education and continuing professional development.