As Bitcoin's price hits a new all-time high, it's now estimated to use as much electricity as the whole of Argentina But is this remotely sustainable?

Justin Rowlatt speaks to cryptocurrency expert and University of Chicago economics professor Gina Pieters about why such heavy energy consumption is an intrinsic feature of Bitcoin, and why the higher it's value rises, the more its energy footprint expands.

But what about it's carbon footprint? That's a debate we get to hear both sides of, with crypto evangelist Ethan Pierse saying that Bitcoin miners are helping to finance the expansion of renewable energy sources, while the more sceptical data analyst Alex de Vries says they are burning plenty of fossil fuels to compete in an expensive and pointless lottery.

Plus Kenneth Rogoff, the former chief economist of the International Monetary Fund, compares Bitcoin to a work of modern art, and wonders whether its future may be as a curiosity at a Star Trek convention in the year 2100.

Producer: Laurence Knight

(Picture: Blue Neon light, Bitcoin shape; Credit: Getty Images)

Poorer countries in search of Covid-19 vaccines are looking east. Agathe Demarais, global forecasting director at the Economist Intelligence Unit, describes how China and Russia are stepping in to provide vaccines where Europe and the US aren't. Yanzhong Huang, senior fellow for global health at the Council on Foreign Relations, explains how this feeds into China's soft power aspirations. Yuan Ding, dean of the China Europe International Business School, and David Haigh, CEO of Brand Finance, discusses China's efforts at soft power so far.

(Photo: A nurse in Brazil holds a sample of a Chinese Covid-19 vaccine)

Covid-19 has ruined millions of wedding plans. Will 2021 spark a race to the altar for those unable to tie the knot? California couple Lauren and Patrick Delgado tell their story. We also hear from Jordie Shepherd, host of the Corona Brides podcast, and the bride tear-gassed on her wedding day. Also, has Covid-19 put an end to the Big Fat Indian Wedding? We ask Lalita Raghav at the wedding planners Ferns N Petals.

Picture: Bride and groom figurines are pictured wearing face masks (Credit: Getty)

The pandemic has brought with it a massive rise in plastic waste. Tamasin Ford looks at how the demand for hygiene along with plummeting oil prices boosted our use of single use plastics. In some countries, it has increased by 50 percent. In other countries, the increase has been even six or seven fold. She speaks to Gary Stokes, the Founder of Oceans Asia in Hong Kong, a marine conservation organisation. And to Amy Slack, head of campaigns and policy at Surfers Against Sewage, an ocean conservation group in St Agnes in Cornwall in the South West of England. Plus Jacob Duer, the CEO of the Alliance to End Plastic waste, based in Singapore - an organisation supported by the private sector. And Elsie Mbugua, an energy trader and founder of Elcy Investments.

The "hydrogen economy" has received a lot of hype, but could this explosive gas fill some critical gaps in a future zero-carbon energy system?

Justin Rowlatt looks at Australia's plans to use its huge solar and wind resources to generate hydrogen from seawater. Miranda Taylor of the government-sponsored agency National Energy Resources Australia lists some of the many potential applications for the gas that the country is taking a punt on. But how many of them will actual prove commercially viable?

Clean energy consultant Michael Liebreich says that despite hydrogen's versatility, in most cases it's likely to prove far less efficient than other technologies. But there are a few key exceptions, some of which could be life saving. Plus, chemistry professor Andrea Sella blows up a balloon, zaps some water, and nearly gives Justin a hernia.

Producer: Laurence Knight

(Picture: Hydrogen pipeline with blue sky background; Credit: Getty Images)

They’re the technical bits of genius businesses cannot do without. On this edition of Business Weekly, we look at the world of semiconductors and why a shortage of them is holding up industries the world over. From consumer electronics to cars, the squeeze on semiconductors affects the supply of everything with a computer chip. Also, Ngozi Okonjo-Iwela becomes the first African and first female director general of the World Trade Organisation. We hear from the woman herself about the task ahead. Plus, should children be learning about bonds, shares and savings accounts as well as algebra and geometry? We speak to pupils around the world keen to learn about finance and money.

To some it may sound absurd to consider hairstyles a workplace issue, but for millions of men and women with African and Afro-Caribbean hair, it is just that. For decades, some hairstyles have been discouraged at work. But things are finally starting to change. This month, the US Airforce is changing its hair code to be more inclusive. We explore the historic racism behind hair-based discrimination and hear from the women who have united to change attitudes and laws. We speak to businesswomen, historians and those in the arts – from the UK, the US and East Africa – to find out what hair has to do with it all anyway. Presenter: Vivienne Nunis Producer: Sarah Treanor

(Image credit: Getty)

How the biggest start-up acquisition out of Nigeria is resonating across Africa. Last year Nigeria saw its biggest ever start-up acquisition - a multi million dollar deal for digital payments company Paystack. The result was a massive shift in the minds of entrepreneurs and investors in Africa’s Fintech scene. The company which processes more than half of all online payments in Nigeria, was started by two graduates in their 20s five years ago. It ended in a $200 hundred million dollar deal with Stripe, the US-based payments software company. Tamasin Ford speaks to Chilufya Mutale, the co-founder and CEO of PremierCredit in Lusaka, an online micro-lending platform operating in Zambia and Zimbabwe. Plus Chijioke Dozie, the co-founder of Carbon, a PanAfrican digital bank operating in Nigeria, Kenya and Ghana who says the Paystack acquisition is not only inspiring for existing entrepreneurs, it will encourage more people to join the Fintech scene. And to Katlego Maphai, the co-founder and CEO of Yoco in Cape Town, a digital payments company for small businesses in South Africa. Plus Maya Horgan Famodu, the founder and Managing Director at Ingressive Capital, a Venture Capitalist Fund based in Lagos in Nigeria which targets early stage start-ups across Sub-Saharan Africa and were an early investor in Paystack. And to Amandine Lobelle, the head of business operations at Paystack. (Picture credit: Getty Creative)

Why Taiwan isn't making enough computer chips. Ed Butler speaks to Jan-Peter Kleinhans, head of technology and geopolitics at SNV, a German think tank, about the central role of Taiwan in the complex global supply chain of semiconductors. The BBC's Theo Leggett explains why the car industry has been particularly hit by the shortage of chips. And Shelley Rigger, professor of East Asian politics at Davidson University in the US, discusses the growing significance of Taiwan in the technology war between China and the US.

(Photo: A man walks past a company logo at the headquarters of the world's largest semiconductor maker TSMC in Taiwan, Credit: Getty Images)

Though children will usually learn how to add, subtract or multiply in school, very often they are not taught the skills they need to manage their money in older life. We’ll hear from children around the world about their understanding of, and relationship with, money. Then, Lily Lapenna MBE, of MyBnk, describes her decades long campaign to improve financial education in UK schools, and how a gap still remains between boys and girls in financial literacy. Eddie Behringer, CEO of the fintech firm Copper, explains how their bank accounts for teenagers can help build skills from early on. And Dhruti Shah, author of the illustrated business dictionary Bear Markets and Beyond, recounts how she wishes she’d realised sooner just how much finance and business would factor in her life, and how a basic business vocabulary can help you understand your world better.

(Image credit: Getty Images)

Eliminating carbon emissions in the next 30 years would be "the most amazing thing humanity has ever done".

In an exclusive interview, Bill Gates tells Justin Rowlatt why he has set his sights on tackling global warming, and how the challenge compares to efforts to contain the coronavirus pandemic - which he is also taking a leading role in, with the funding of vaccine rollouts. The Microsoft founder and world's most influential philanthropist is particularly focused on the parts of the economy that are the toughest to decarbonise - things like cement, steel and aviation.

His thinking is strongly influenced by the energy historian Vaclav Smil. Gates says he has read every one of the Czech-Canadian professor's 40-odd books on the subject. But in a rare interview, Professor Smil tells Justin that he has a decidedly more pessimistic view of how quick and painless the energy transition can be.

Producer: Laurence Knight

(Picture: Justin Rowlatt interviewing Bill Gates at the Natural History Museum)

On this episode of Business Weekly, we examine the world of amateur traders. One in five Americans now play the stock market, but there are warnings that inexperienced traders could be caught out. Also, we take a look at the new space race. Commercial enterprises are vying to see who can get the most satellites into orbit in order to provide internet connectivity to some of the world’s poorest and most rural regions. In the week when Bumble made its market debut, we hear how dating apps are faring during the pandemic. And we chat to the man who provides books for home offices so his clients can seem well-read on video conferencing calls. Business Weekly is presented by Lucy Burton and produced by Matthew Davies.