Business Daily

Helium is the second most abundant element in the universe but very rare on earth. Professor Andrea Sella of University College London, explains to Justin Rowlatt the properties that make this inert gas so useful. He explains where it comes from and where it goes to.Washington correspondent, Jonny Dymond, is out in the wilds of the Texas pan-handle to explore the US national helium reserve. And, we hear from the head of General Electric's Magnetic Resonance Imaging division - one of the world's biggest users of helium - on why the gas is so important in the fight against many diseases.

In the first of Elementary Business - a new series of programmes about the chemical elements - Justin Rowlatt asks whether phosphorus poses the biggest looming crisis that you have never heard of. Since 1945, the world's population has tripled. Yet the fact that we've still managed to feed all those mouths is in no small part thanks to phosphates. We mine them, turn them into fertiliser, and then spread them onto our fields, whence they are ultimately washed away into the ocean. Justin speaks to chemist Andrea Sella to find out just why phosphorus is so vital to sustaining life, and modern agriculture. He also hears from Jeremy Grantham, a voice from the world of high finance, who warns that pretty soon Morocco may find itself with the dubious honour of a near-monopoly of the world's remaining phosphate supplies. And Justin travels to the lowly town of Slough, near London, to take a look at one new way of staving off the dreaded day when the world eventually runs out of the stuff.(Photo: The Thames Valley sew