Hey Truckers! DEF vs Battery’s My Research and Questions

https://en.m.wikipedia.org/wiki/Diesel_exhaust_fluid

https://youtu.be/uQHvi2Lgnac

https://www.tesla.com/semi

https://www.dailymail.co.uk/news/article-11572973/Harvard-professor-tells-Joe-Rogan-tech-devices-lithium-batteries-come-slave-mines.html

Def fluid seems to hit a lot of the pro environment marks by turning its carbon in water and nitrogen vapour both harmless in our atmosphere, so why so much hate towards our vehicles?
Why can’t this be modified to gas engines way easier and infrastructure is in place