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Justin Trudeau takes over as Canada's prime minister on Wednesday, striking out on the diplomatic stage with a fortnight of back-to-back summits leading up to the UN climate talks in Paris
The Liberal leader swept to power last month with ambitious pledges to change tack on global warming and return to the multilateralism sometimes shunned by the outgoing conservatives.
But experts warn of an uphill road ahead for the 43-year-old son of Canada's beloved late premier Pierre Trudeau.
"There are clearly a lot of challenges (ahead) for the new government," said University of Ottawa law professor Carissima Mathen.