Zero Waste Hour. ... The “Zero Waste Hour” was launched by Her Majesty, the Gyaltsuen of Bhutan on 2 June as an initiative to instill behaviour change towards proper waste management and practice sustainable consumption lifestyle leading towards safe, healthy and clean environment. Thus, the chungkha Primary School observes every 2nd of the month. on 2nd october, cub scout students and faculty members joined to clean the school campus.