It sounds like you're describing a 2-stroke engine, which older Vespas did use. But modern ones use a 4-stroke engine and should have the same emissions profile as any other motorcycle.
Have you ever "shipped" something that at no point in its journey was carried on a floating vessel? Do you correct people when they say they're shipping something by ground or air?
Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU which is widely used today is often called Linux, and many of its users are not aware that it is basically the GNU system, developed by the GNU Project.
There really is a Linux, and these people are using it, but it is just a part of the system they use. Linux is the kernel: the program in the system that allocates the machine's resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. Linux is normally used in combination with the GNU operating system: the whole system is basically GNU with Linux added, or GNU/Linux. All the so-called Linux distributions are really distributions of GNU/Linux!
The Piaggio Vespa is a scooter. The Piaggio Ciao is a moped.
It is not at all noisy unless I rev it high, which I try to avoid doing most of the time. It is not loud like for instance a Yamaha T-Max, not helped by it attracting mostly complete retards.
Obviously there are always dumb people mounting akrapovic or other noisy aftermarket exhausts on any bike brand but it is also the same with cars.
Electric Vespa anyone?
I suspect that other brands of electric motorbike may be better