Marine litter is a global problem that affects every ocean in the world. Litter is an environmental, human health and socio-economic problem that is a symptom of a highly disposable society. With worldwide growth in the amount of solid litter thrown away every day, combined with the slow rates of degradation, the amount of litter ending up in the marine environment is increasing. This Massive Open Online Course (MOOC) seeks to inspire students to take action and leadership in the arena of marine litter through stimulating interaction with all groups involved. The MOOC has been built on the highly successful first marine litter MOOC that was organized in 2015 and will consist of a two-week leadership track and an eight week expert track. Marine Litter MOOC 2.0 will start May 22, 2017.