Gasless Lawn Mower? Answered

Man, have you thought about this?
Really?
Human-powered lawnmowers already exist, they have evolved to do the job with a human-push.
A bicycle would need a fat drive-wheel to achieve traction without ragging-up the turf. "product that you could attach to your bike" won't work.
(add "or motorbike...)

L

Q5 is a pain - I don't buy gas at all, but the question demands an answer.

(Just a reaction to the title: Electric, or old-fashioned push mower, have generally been my preference.)