CANGGU (Bali) • Thirty-four-year-old Rina Agustina hands out old rice sacks, gloves and tongs to smiling volunteers in the hope of reaping another harvest: trash.

Most Sunday evenings, for more than a year now, Ms Rina, through Swiss-based non-profit environmental group Trash Hero, organises a clean-up of Munggu Beach - a stretch of beach marbled with sand and volcanic rock that typifies much of Bali's coast.