"The Scramble for Rare Earths". BBC Radio 4. 26 September 2022. Retrieved 6 January 2023. This link leads to the first episode in the series, and links to the subsequent episodes can be followed from there. Depending on one's computer settings, one episode may automatically run on to the next. Note that the BBC sometimes allows a programme to be listened to only once by a given IP address, and that subsequent attempts to listen to it again may be "autoblocked".