UNESCO eDNA expeditions This is a citizen-science project that will determine (a) the richness of fish species, and vulnerable or endangered species, across the 50 marine World Heritage sites by collecting and analysing environmental DNA and (b) how the effects of climate change might be impacting the distribution and migration patterns of these species. Local communities including youth at the marine World Heritage sites will be engaged in the eDNA expeditions. The project is a joint initiative across the Science (IOC) and Cultural Sectors of UNESCO.