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Russian aggression in Ukraine and the world's quest to end the dependence on Russian oil and gas has created an opportunity for Venezuela to negotiate an easing of the US-imposed oil sanctions. But, as Ivana Davidovic discovers, there are also many pitfalls on that journey.Venezuela may have the world's largest oil reserves, but years of underinvestment have severely impacted output, as professor Terry Karl explains.Former chairwoman of the refiner Citgo, Luisa Palacios, outlines where Venezuela still manages to sell its oil and the role played by Iran in that trade. She also thinks that a sanctions deal could be made if the Maduro administration is willing to relinquish some control over production.But Venezuela expert David Smilde is worried that political, rather than practical, considerations - in the US and Venezuela - might muddy the waters.Caracas-based journalist Francis Pena goes on a lengthy journey to buy petrol in her home city, illustrating how economic mismanagement and sanctions are affecting day-to-day lives.Presenter/producer: Ivana Davidovic Image: A motorcycle passes in front of an oil-themed mural in Caracas, Venezuela. Credit: Javier Campos/NurPhoto via Getty Images.

Tim Hayward takes a journey into the world of fungi. There’s a global wave of interest in the potential uses of fungi right now - and businesses are catching on and playing their part.Tim starts at the Fungarium in Kew Gardens, the world’s biggest collection of dried fungal specimens, guided by collections curator Lee Davies. He then heads to a forest in Finland, where chief executive Eric Puro and lab manager Joette Crosier walk him through the setup at Kääpä Biotech - one of a new breed of fungally-focussed companies with big ambitions rooted in a passion for mushrooms and mycelium. Then he talks with Albert Garcia-Romeu, an assistant professor of psychiatry and behavioural sciences at the Johns Hopkins University School of Medicine. Albert is part of a research team looking at the fungally-derived compound psilocybin - about which there’s a huge amount of interest relating to its therapeutic potential.Presenter: Tim Hayward Producer : Richard Ward. Image: Shiitake (Lentinula edodes) mushrooms being cultivated at Kääpä Mushrooms, Karjalohja, Finland. Used with permission.Tim’s three-part series about fungi, ‘Fungi: The New Frontier’, is available now on BBC Sounds.

China, the so-called engine of global growth, seems to be stalling badly right now. The country is facing rising unemployment, falling factory output and a collapsing property market. Plus, a growing number of regular Chinese citizens are complaining that the country's tough anti-Covid strategy isn't working. China has faced choppy economic waters before. But with record high-levels of domestic debt, does it now have the resources to shore up the holes when firms, banks and even local governments start to run out of money? And what are the implications for the rest of us?Presenter/producer: Ed Butler Image: Children play basketball in front of a housing complex built by debt-laden Chinese property developer Evergrande in Beijing. Credit: Noel Celis/Getty Images.