> Harsher chemicals, more mining, more processing, lesser life of a car and battery, less mature tech so more wastage, etc.

Extracting, manufacturing, and transporting gas more than offsets those differences. Oil refineries are nasty not to mention mid to large scale oil spills.

> EV is the way to go but is it going to scale sustainably to say 25% or more of all cars?

EV’s are already 20% of global sales, will it scale isn’t some deep question 5x current production would be completely replacing ICE cars.