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"During the past 10 years, we have catalogued nearly a million old books, and also trained many people so they can preserve them," Su says.

"Eventually, it's down to the airlines to decide whether or not to utilize the new traffic rights," he said. "If there is no demand, the airlines won't operate the route, otherwise they will lose money. Profitability is really the main concern."

"Every bookshop is a condensed version of the world," says Jorge Carrion, a Spanish writer and literary critic who roams the globe in his study of unique and culturally influential bookshops.

"Faced with dangerous environments, high work intensity and inadequate welfare, the job is an unappealing choice for most people, which makes it difficult for the current rescue team to meet the increasing demands," he said, adding that more than 20 million domestic ships enter and leave the ports each year, along with more than 500,000 international ships.

"Exploring opportunities for future collaboration on commercial-scale operations and investments in hydrogen production is vital if Australia is to realize the significant economic benefits and job creation opportunities hydrogen brings," he said in a statement.