Battery electric buses have maintenance costs half of fuel cell buses and energy costs for distance traveled of a third of fuel cell buses.

Battery electric buses already cost less than fuel cell buses and are getting cheaper.

I would strongly recommend two things.

First, sit with this material for a while.

https://cleantechnica.com/2022/05/06/seeing-climate-solutions-clearly-through-biases-missing-data-is-challenging/

Second, stop commenting in ignorance on the internet. Take care.