* Channel 4 (UK) documentary, Catastrophe: Snowball Earth episode 2 of 5, first screened Dec 2008, documentary narrated by Tony Robinson, advocates snowball Earth and contains interviews with proponents.
* Channel 4 (UK) documentary, Catastrophe:Snowball Earth episode 2 of 5, first screened Dec 2008, documentary narrated by Tony Robinson, advocates Snowball Earth and contains interviews with proponents.