Which program, In Bad Taste or Life on Earth was released earliest? 
In Bad Taste: In Bad Taste is the second documentary film from Steve Yeager, who had first made "Divine Trash" in 1998. Life on Earth (TV series): Life on Earth: A Natural History by David Attenborough is a television natural history series made by the BBC in association with Warner Bros. and Reiner Moritz Productions. Life on Earth (TV series):  It was transmitted in the UK from 16 January 1979.
Life on Earth