LLM shill argument in a nutshell: "while there is room for improvement in catalytic converters, they are improving practically by the month! Within a decade, internal combustion engines will put out air that is so breathable, it could be used for ventilating a maternity ward."

The exhaust from a hydrogen fuel cell car is drinkable water.

However, experts do not recommend drinking it straight from the tailpipe because the water can pick up dust, dirt, and chemical residues.

(it had to be disclaimed!)