So it's been a while since anyone's posted here, but I felt this was relevant enough to bump the thread. I've got some screenshots from the short films:
Aw, don't be so sad! It's gonna make me sad!
This short film is "The Glorious Earth" or "Earth - You are Blue, Beautiful...", and I think it was made in 2004.
(Japanese title: 鉄腕アトム 特別編:地球 ~あなたは青く、美しい...)
And I just had to GIF this part, so here's that:
This short film is "Doomsday" or "Earth's Last Day", made in 1999.
(Japanese title: 鉄腕アトム ~地球最後の日~
Tezuka Productions actually uploaded 3-minute clips of these short films to YouTube, so if anyone's interested, search the Japanese titles on YouTube.
I had more screenshots that I wanted to post, but Photobucket wasn't cooperating so this is all I'm posting for now. I'll probably edit this post if Photobucket decides to let me upload any more pictures and link them here before my edit time runs out.