In the context of a transition to lower energy consumption, one considers, among other things, the energy consumption of the Internet. Among the various uses of the Internet, it seems that the transfer and "consumption" of video takes a lion's share (and that 3d material is motivating the accelerated transition to 5g technology). Among those videos, the share of educational videos has increased during the forced lock-downs of 2020-2021 due to the covid19 pandemic.
If academics were to anticipate the maintenance of academic structures in a world with lower energy consumption,
would it make sense (energy wise) to consider replacing Educational Videos by Educational Sound Podcasts as a way to reduce the storage space and bandwidth required for educational material, eventually with a synchronized set of illustration slides?
Do we need a special data format for those (especially the synchronized set of slides), or will video compression algorithms do the trick?
What existing examples of such teaching material (with synchronized set of slides) are there online?