I heard there is an English dub of Nausicaä. Is it true?
Yes. One is the horrendously mangled Warriors of the Wind from New World Pictures; it’s rather difficult to find these days, but please forget about it if you’ve seen it. Disney redubbed the film in 2003 with Alison Lohman, Patrick Stewart, and Uma Thurman. For more information see the Availablity page and the Credits page.