[Retric]

You can't take 50m modern cars with pollution control systems then say worldwide car pollution = ~#of cars in the world / that number. The worst cars running on the worst fuel create several times more pollution than a new modern car. And world wide there are a lot of old cars.

So, in this case yes, they are saying something that's wrong.

[randallsquared]

You're complaining that they should have compared to only shiny new cars, rather than actually existing cars, because then the comparison would have fared better for the cars?