QUOTE (Andy Capp @ Dec 14 2016, 12:46 PM)
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I read that Hydrogen gas (H2) is a molecule.
Yes it is. It's two atoms bonded together as a molecule. I was just saying that a single atom isn't a molecule (which is what BerkshireLad said). I only did O level Chemistry, so I'm no expert! However...
On the subject of diesel, carbon footprint or not, it's far more dangerous to humans than petrol - otherwise why would cities be looking to ban it? Hard to achieve in Central London of course, since most of the traffic is buses and taxis.
I read that in Delhi which suffers from major smogs, they are proposing to use retired jet engines mounted on trailers next to coal-fired power stations to blow the gases into the upper atmosphere. Kind of misses the point, I think!