The Bottom Line

How can the aviation industry marry sustainability with increasing passenger numbers? Since the deregulation of Europe's airlines in the late 1990s, more and more of us have been flying every year. Whilst this may be good news for the airline industry, it's not good news for the environment. Manufacturers are trying to make models lighter and more fuel efficient, with a pledge by IATA to cut emissions to 50% by 2050. Nevertheless, experts say we are at least fifteen years away from hybrid engine powered flight. Evan Davis and guests ask whether commercial aviation can meet its climate targets through new technology and more fuel efficient engines, whilst keeping costs down for the airlines and the customer? GUESTS Paul Kahn, president, Connectivity, Cobham Plc Volodymyr Bilotkach, economist, author of The Economics of Airlines Rob Morris, head of Global Consultancy, Ascend by Cirium Presenter: Evan Davis Producer: Julie Ball Editor: Hugh Levinson

What can we learn from how one medical start-up fooled Silicon Valley and the world? Elizabeth Holmes dropped out of Stanford University at 19 to start Theranos. She promised investors and the public a revolutionary blood diagnosis machine which would be less painful, accessible and affordable than ordinary lab tests. She managed to raise $9 billion in funding. Now the company is worth nothing. Holmes and her business partner may face up to 20 years in prison for fraud. How did she manage to deceive some of the world's cleverest minds - and is there something about start-up culture and the cult of the visionary leader which encourages charlatans? Evan Davis and guests discuss. GUESTS Rebecca Jarvis, chief business, economics and technology correspondent, ABC News Margaret Heffernan, author and entrepreneur Jos White, entrepreneur and partner, Notion Capital Producer: Julie Ball

You trust financial professionals to grow your long term savings and pension pot. But how do you know if they are investing it wisely? The UK investment industry is awash with complicated terms and conditions, and unclear and sometimes high charges, which can eat into your monetary returns. The woes of star fund manager Neil Woodford, who has temporarily frozen one of his funds to its investors after poor performance, highlights just how complicated an industry it is. Is some clarity starting to emerge? Evan Davis and expert guests look under the bonnet of the UK investment industry. Guests: James Anderson, partner at Baillie Gifford, who jointly manage the Scottish Mortgage Investment Trust Bella Caridade Ferreira, chief executive and founder of Fundscape Sean Hagerty, managing director of Vanguard Europe Producer: Lesley McAlpine

Poundland, Lidl, B&M Bargains and Primark are thriving successes on the High Street, while more mainstream retailers have seen their profits hit. Just how do the discounters keep their prices so low? Keeping the business model simple, supply chains lean and costs down are key parts of the story. Guests: Barry Williams, Managing Director of Poundland Simon Arora, Chief Executive, B&M Bargains Catherine Shuttleworth, Chief Executive of Savvy Marketing

Can a sudden change in direction save a new company? Evan Davis and his guests hear stories about the start-up's nightmare: the original product is not selling, and cash is running out. Can changing focus - with a new service or product - pluck success from the jaws of doom? Speaking to entrepreneurs and experts, he learns about how in a range of sectors, from sanitary products to event ticketing, the key is to shift while staying true to the original vision. Guests: Celia Pool, cofounder DAME Edmund Glover and Nick Stone, FIXR Ramdane Mir, cofounder Cobbleweb