We need to transform the way we grow food if we are to head off disaster - so say leading agronomists. But can it be done?
The modern agricultural industry, borne out of the Green Revolution that has multiplied crop yields since the 1960s, has contributed to multiple new crises - obesity, soil degradation, collapsing biodiversity and climate change. To address this "paradox of productivity" a whole new revolution is needed, according to Professor Tim Benton of the University of Leeds and think tank Chatham House.
The BBC's Justin Rowlatt travels to the world's longest running scientific experiment, a collection of wheat fields dating back to the 1840s at the Rothamsted agricultural research centre just outside London, to ask resident scientist John Crawford whether our past success in staving off global hunger can be sustained in the coming decades.
Plus what role should the United Nations' Food and Agriculture Organisation play, especially as that body prepares to appoint new leadership? Justin speaks to the former UN Rapporteur for the Right to Food, Olivier de Schutter.
(Picture: The Broadbalk research wheat fields at Rothamsted; Credit: BBC)
Istanbul's vexed elections
The Turkish commercial capital must vote again for a new mayor after March's election result was overturned by the government.
Ed Butler visits the city and meets Ekrem Imamoglu, who narrowly won in March but spent just 17 days in office before the decision was made to re-run the election. Mr Imamoglu says he saw overspending and waste, and that around 10% of the city's budget could be saved.
The country is also experiencing an economic slowdown, and Ed speaks to Deniz Gider of the Turkish construction workers' union, about how it's affecting his members. Plus economist and political scientist Atilla Yesilada explains how Turkey finds itself in this current economic crisis.
Hostile environment for immigrants
The attitude towards immigration in Europe and America is hardening under a wave of populist politics, and businesses are finding that despite labour shortages in many sectors, bringing workers in from abroad is becoming harder.
The BBC's Frey Lindsay reports from Stockholm on a phenomenon dubbed "talent expulsions" - highly skilled workers being ordered to leave the country because their paperwork is not perfectly in order.
A similarly bureaucratic approach has been taken in the UK, where it is dubbed the "hostile environment" for immigrants. Since the 2016 Brexit referendum some three million EU citizens suddenly find themselves subject to it. Dutch campaigner Monique Hawkins tells how she was told to leave the UK despite having lived there more than three decades. Meanwhile Danny Brooks of international recruitment firm Virtual Human Resources says UK businesses are already finding it much tougher to attract the talented employees they need.
We also get the view from Singapore. About half the city-state's residents are immigrants, after several decades of a successful pro-business immigration policy. We ask former diplomat Kishore Mahbubani what is the secret of his country's success.
(Picture: "Denied" rubber stamp; Credit: bankrx/Getty Images)
Wine and trade wars
Wine exports from California's Napa Valley have dried up amid an intensifying US-China trade war.
In some cases, prices have doubled, dealing a blow to an industry that has already seen young people shun wine for bourbon and beer.
The BBC's Regan Morris speaks to third generation wine makers Michael and Stephanie Honig of Honig Vineyard & Winery, who say the trade spat has reduced their Chinese sales to zero.
We also hear from Honore Comfort, Wine Institute vice president of international marketing, who says cultivating export markets will ensure the industry keeps growing.
It's not all doom and gloom. Vivien Gay, Silver Oak Cellars director of international sales says it's been business as usual for high-end wine makers like hers.
Picture: People toasting with red wine (Credit: Getty Images)
The next financial crisis
It's more than a decade since the global financial crisis. Central banks have pumped trillions of dollars into the financial system to support markets and the broader economy. But there are warning signs that major risks may be re-emerging in the financial markets.
This month, fund manager Neil Woodford suspended trading in his largest fund after rising numbers of investors asked for their money back. Could this highlight a vulnerability in the financial system that runs right through the investment management business?
The BBC's Manuela Saragosa and Laurence Knight speak to two veterans of the investment community: Mohamed El-Erian, chief economic adviser at Allianz and former head of Pimco in California; and Lord Paul Myners, the former head of Gartmore in the UK. Both worry that investors are unaware of the risk they are running that they won't be able to access their money when they most need it, and warn that regulators could be blindsided by the next big crisis.
(Picture: A trading screen flashes red; Credit: Getty Images)