I don’t know why this didn’t occur to me sooner. Even if you just use a junk account to like and subscribe it’s the cheaper version of donating.
PBS Terra, for one, has actual climate change news and science. In addition to all the other cool things, and, ofc, PBS kids.
Here’s the list: NOVA PBS official, PBS, PBS Terra, American Experience PBS, Frontline PBS Official, PBS Documentaries, PBS NewsHour, PBS kids, PBS Eons, PBS Origins, PBS SpaceTime.
NOVA has started uploading some documentaries. I think the best way we can show them that we’d want to see them upload more of their catalog is to leave comments on the videos asking for that—I know that Spacetime, at least, reads every comment left of their videos, so it’s a great way to contact the creators.