This sounds alarmistic to me. Diesel emissions are exaggerated. European emission standards set limits for diesel emissions that are just minutely different from gasoline emissions. American limits for diesels are notorious for being more restrictive than for gas engines. All of that considered, diesels are plainly more economical and more efficient on pretty much all common engine size ranges
First off, the big problem with diesel is not CO2, but NOx gases, which are way more immediately dangerous to human health. That's why some cities are thinking of banning them ASAP right now. Second, besides VW which was creating even 40x the emissions than the standard you mentioned required, pretty much all the other car makers were creating 10-15x as many emissions, too, thus making that "strict standard" way loos…
So is the Ozone. Diesels with lower NO emissions than that of gas engines are made all around the place.
All same, if not worse for particulate emissions