Kaze no Tani no Nausicaä, Giniro no Kami no Agito Recommendations
They have nicely similar story lines... "man devastates the earth and the forest comes back with a vengeance."
They both have good dramatic action. I personally liked Nausicaa more but the main character in that was a girl so i relate better with her than the male main character in Agito. Still Agito was a great movie with better art and graphics than the older Nausicaa. It was definitely one of the better movies i have seen lately. So if you enjoyed either of these movies, be sure to check out the other.
in terms of the storyline they both are similar. Both revolve around large parts of the world being inhabited by plants and military/army trying to stop the spread.
Some similar characters, and the man vs. nature theme.
Both take place in a small village over turned by a deadly forest. Both main characters try to tell people that the forest is harmless and try to save it from enemy armies. Both movies have eerily similar traits that you notice right away.
Both are about a struggle between man and nature after man abuses his abilities and throws off the balance between the two. Nausicaa, like most ghibli films, sends more of a message about humanity than origins but both are very well made.
In these worlds, the plants have taken over and call the shots. Both are very good movies and have great soundtracks