What was the first Studio Ghibli movie?

The answer is: Nausicaä of the Valley of the Wind. The story of Nausicaä and the Valley of the Wind is about as Ghibli as it gets. The main character is on a quest to try and find a way to help humans and nature co-exist peacefully and not kill everything with weapons. This one came out in 1984 and Ghibli is still trying to get us to respect nature. Hopefully they keep trying because the movies are cool.Source