Dr Who tackles climate change, corporate power and the world food crisis

The Green Death screened in 1973 was a slice of effective Green Party politics, very enjoyable (other than the dodgy hair cuts).

Evil corporation, illegal waste dumping, insane computer (who quotes Nietzsche and hums to Wagner), hippie heros and giant killer maggots.

In short perfect viewing.

The BFI notes:

Unusually, the hazard in The Green Death comes not from extraterrestrials, but