Rare earths are critical elements, essential for everything from smartphones and green energy to defence, and indeed the modern world.

Whilst China controls 70% of rare earth production, threatened export restrictions have set superpowers including the USA and Japan racing to regain control of the industry within one year. With billions pouring into rare earths in the months ahead, is this enough time to tip the balance or will China's grip hold firm?

With exclusive access across the US and China, the latest special in the award-winning series goes behind the headlines to investigate this crucial international power struggle.