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The aviation industry is one of the world's biggest contributors to climate change - but does a social movement begun in Sweden now threaten to stigmatise air travel?It's called "flygskam", and Manuela Saragosa speaks to one of its originators, Susanna Elfors, whose tagsemester Facebook page helped convert her fellow Swedes to the environmental virtues of train travel. Meanwhile John Broderick, professor of energy and climate change at Manchester University explains just how big a carbon footprint an individual long-haul flight can have.The movement is already having an impact on Scandinavian travel habits, and threatens to go worldwide. So what does the industry make of it? We ask Michael Gill of the International Air Transport Association, as well as Boet Kreiken of Dutch airline KLM, which is already calling on its customers to "fly responsibly".Plus Manuela asks Tony Wheeler, founder of the Lonely Planet guidebooks that first popularised travel to exotic corners of the globe, whether he feels guilty about having enabled the casual flying culture.Producer: Laurence Knight(Picture: Aeroplane vapour trails; Credit: yellowpaul/Getty Images)

After a controversial extradition law sparked mass protests, is Hong Kong's position as a global financial centre under threat? Vivienne Nunis speaks to business owners in Hong Kong about the recent protests, hedge fund manager Edward Chin on the impact the crisis is already having on Hong Kong's financial reputation, and former investment banker and governance campaigner David Webb about the history of Hong Kong and China and whether the 'one country, two systems' policy is being dismantled.(Photo: Protestors take to the streets in Hong Kong in June, Credit: Getty Images)

Should you let websites track your online movements? Vivienne Nunis speaks to Frederike Kaltheuner from Privacy International and investigates the split-second auction process where firms bid to put targeted ads in front of your eyes. We hear from DuckDuckGo, the search engine that promises to protect your privacy, and controversial Israeli firm The Spinner, which uses cookies to subliminally change people’s behaviour.(Photo: Chocolate chip cookies, Credit: Getty Images)