[omnee]

Like others I want to recommend the manga. It's a masterpiece and in my opinion Miyazaki's Magnum Opus.

[echelon]

It's certainly his biggest world, and the themes of climate change and environmentalism are directly relevant.

I still am not sure which between Nausicaa the manga, Nausicaa the film, Princess Mononoke, or Spirited Away are his magnum opus. They are all spectacular.

I posted below about his manga, "Shuna's Journey". It's also exceedingly relevant.