DHARAMSHALA (AFP) - Lobsang Sangay, a 43-year-old Harvard scholar, took office Monday as head of the Tibetan government in exile, vowing to free his homeland from Chinese "colonialism". After being sworn in at a colourful ceremony in the Indian hill town of Dharamshala, Sangay warned China that the Tibet movement was "here to stay" and would only grow stronger in the waning years of the Dalai Lama. The new prime minister, who has never set foot in Tibet, is assuming the political leadership role relinquished by the 76-year-old Dalai Lama in May.