as my favourite economist likes to say, there's no such thing as solutions - there are only trade-offs.
i'd be very interested in hearing a high level study of whether there's more energy consumed by having server farms than there are in producing millions of pieces of plastic shipped to individuals. i guess it's possible that there may be more energy consumption, maybe even more material consumption, but i'm pretty skeptical of that.
you also have to consider not only all the material and energy that goes into those disks, but all the material and energy that went into blu ray and dvd players, and all the extra energy it took to keep those running.
and it's not only blu rays and dvds that have gone away. look at all the cds that have vanished, no longer produced - instead we get music by having it beamed by electrons. and all the other items that have vanished into our phones and smart tvs and rokus and so on. cameras, radios, clock-radios, all those devices that all had to be produced and all took energy to keep running - a lot of energy in some cases.
it 'might' be the case that there's more energy consumption from streaming compared to buying a blu-ray. maybe. i'm willing to take your word on that if you have a study to back that up. but i wouldn't restrict your scope to only movie streaming. there are lots of other efficiencies from having all those devices collapsed into a phone/laptop/tv.
edit:
just popping back in to post a link to an interview with andrew mcafee from the great econtalk podcast.
his book 'more from less' came out about two years ago, and is essentially about how in the past 20 years or so, material consumption has become decoupled from economic growth in modern economies. the interview's a great listen, and his book is very much worth a read if you're interested.
it's one of the most interesting and least widely known facts about the world-wide economic miracle of the last 40 years or so. not only is the world much richer, not only has poverty collapsed, but in the most advanced economies, we're actually using less stuff. we're consuming less material. we've dematerialized, and that's something really remarkable, really good, and movement away from things like physical media, move towards smaller, multifunction devices is a big part of that.
https://www.econtalk.org/andrew-mcafee-on-more-from-less/
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