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How rocks on the ocean floor could be key to the transition to electric cars. Justin Rowlatt speaks to Gerard Barron, boss of DeepGreen, a company that wants to gather rocks from the ocean floors rich in the metals essential for making electric car batteries. He tells us why this kind of mining is crucial to transitioning away from fossil fuels. Louisa Casson, senior campaigner with Greenpeace, warns of the environmental devastation this could cause. And zoologist Adrian Glover tells us how mining could take place alongside conservation of the deep seabed. (Photo: A sunset over an ocean, Credit: Getty Images)

Can technology help eradicate forced labour from global cotton supplies? A confrontation continues to rise between Western powers, global brands, and the Chinese authorities over the use of forced labour and human rights abuse in cotton production in the western region of Xinjiang. Sophie Richardson, China director at Human Rights Watch, explains why transparency from the Chinese authorities over the whole cotton supply chain is unlikely to be forthcoming. With that in mind, some technology companies are volunteering their services to mark or trace the DNA of cotton, so apparel companies can be sure that it's not from a region with suspected forced labour. Jim Hayward, CEO of Applied DNA Sciences, explains how their particular cotton tagging technology works. But John Gapper, business columnist at the Financial Times, cautions that without larger industry willingness to uproot their business models, at considerable cost, the tech can only go so far to solve the problem.Presenter: Tamasin Ford Producer: Frey Lindsay(Picture: Cotton from fields in Xinjiang, China is displayed in the palm of a cotton-picker's hand. Picture credit: FREDERIC J. BROWN/AFP via Getty Images)

When the world of crypto currencies met with the world of art, they created what's called a non-fungible tokens or NFT. Some say NFTs could redefine what we think of as art while others think it’s just the latest crypto craze that may well end in financial losses and tears. (Picture: Artwork by Jazmine Boykins/ Blacksneakers, courtesy of the artist)