Just got a partial answer from a team member of donella meadows archives saying I'll have to wait a week for the person who knows best about this to come back.

In the mean time, here are the reading suggestions I got:

- http://donellameadows.org/donella-meadows-legacy/danas-writi...

- http://donellameadows.org/archives/the-club-of-rome-and-sust...

- http://donellameadows.org/archives/forty-years-later-the-rec...

I'll ping you when the news come

final answer, as far as the archivist knows:

http://www.videoproject.com/Last-Call.html

and this youtube film https://www.youtube.com/watch?v=kz9wjJjmkmc

which has old footage in it but is not the from the 70s conf.

Keep looking

So far nothing (google,ddg,this website). I'm not even sure it was recorded at this point.

I should email the website team directly they probably know.

ps: mail sent