Glass overboard in the 1970's

First, a memory:   in about 1974 or 1975, I had my first weekend on the rather decrepit Navy Reserve training vessel TV Gayundah,  being a good little Navy Cadet on a first time experience of seeing Moreton Bay and pretending to be a sailor.   I remember it had anchored off Moreton Island, at night, and it was a pretty impressive sight getting up in the morning and seeing the blue, clear water and the long, pretty pristine looking island close by.  (It had not, at that time, yet been overrun by 4WD on the beach.)  The vessel itself was a converted "Motor Refrigeration Lighter", and the sleeping quarters were in what used to be the refrigerated hold.   It was pretty cramped, old and smelly, but it had a certain old world appeal.   I have found a photo on the 'net:

(Gosh, I must seem old for having been on that...)

That night, people were having soft drinks (or beers?) on deck, and at one point a kindly navy cadet officer (a school teacher in real life) called out to everyone that he had seen glass bottles floating in the water, apparently from our little ship, and he told us to be more considerate and don't throw bottles overboard.  True, this may have been because we were near the island and our bottles could easily have ended up there:  but still, I think that, in principle, he was sensible enough to feel throwing rubbish overboard was not appropriate.

Fast forward to 2019, and this is what twit Patrick Moore says he was doing, around the same time as my experience,  when he was doodling around the oceans with Greenpeace:

That sounds..really pathetic.