The degree may be called a Bachelor of Science but Mechanical Engineering isn’t considered a scientific discipline is it? Sincere question, I don’t know. It certainly isn’t one of the natural sciences like climatology or meteorology.
I can't take anything away from Bill Nye's accomplishment in getting that degree. But "educated" doesn't mean "smart." And a degree in Mech E doesn't mean he knows bugger-all about science in general.
He's a lefty enviro-shill. You can get better science cred from Cracker Jacks or a Magic 8-Ball.
Mechanical Engineers design weapon systems. Civil engineers design targets.