The actnowforee website has a 4.5 minute voiced-overed video / animation presentation that covers a number of points made by Bill Stapp in a report on the Tbilisi conference. You can see/hear it here , and it's good to hear these contemporary comments. But there's no point watching it if you're looking for insight into environmental education as it is hardly mentioned – or if you're looking for a great animation. However you will get a good feel for how hard they all worked (0600 to 0300), and what a great experience they had: delightful time! very friendly people! lovely city! magnificent bread! excellent preparation! ... . This blandness is unlikely to be Stapp's fault as what we have is abstracted from his report which I know was critical in parts. I've been looking for the original, but to no avail. I'll keep trying.
On the same page, there's a 5 minute film of some of the conference highlights. As I may have noted before, this is much better if you turn the sound down very low. In it, watch out for how often there are shots of Amadou-Mahtar M'Bow the UNESCO Director at the time. This is his UNESCO profile. For what is probably a more balanced view of Mr M'Bow's many talents and interests, see this.
In watching both videos, I'd say it's important to bear in mind that in 1977 the Cold War was still raging.