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Zero emissions from a heat engine? Thermodynamics would like a word with you, Mercedes advertisers.
I'd like to see their definition of 'emission'... Invisible to the environment? Let's just ignore the entire manufacturing process for that half ton hunk of steel then.
Yeah, I looked to see if there was an asterisks next to that 0.0 emissions, but no. This car does emit heat and water.
But, probably worse than the manufacturing process, you have to ask where they are getting the hydrogen. That is probably far from a 'zero emissions' process. It would be interesting if emissions considered the total fuel chain. I wonder how it would stack up to a comparative gasoline engine if that were considered.