Any type of combustion is going to produce greenhouse gasses. Hell make a jet run off water, and you still produce a greenhouse gas called "Steam". Water vapor accounts for 70% of all greenhouse gasses.

Quit acting holier than thou. Just do the project because it will be fun. Or build a solar powered jet. Then you claim what you are saying.

Curious, what kind of vehicle do you drive?

Edit: Better Idea. Invent anti gravity.

Edit Edit: Way better Idea. Invent warp drive.

Edit Edit Edit: Way Way better idea. Invent a holodeck from star treck so I can create a hologram of a younger Jennifer Anniston.