In January the island’s beaches were inundated with waves of plastic pollution, a phenomenon that has been getting worse by the year. Photographer and film-maker Sean Gallagher travelled to Bali to document the increasing tide of rubbish washing up on beaches and riverbanks, and the people facing the monumental challenge of cleaning up. His portraits are on show as part of the 2025 Head On photo festival at Bondi Beach promenade until 30 November