The global climate has been cooling for 21 years. CO2 levels fell 2 years ago, by 4.5%. Last year by 6%: so the incurable problem has been solved by diesels.
Now the oil producing countries have decided CO2 does not cause Global Warming: we could have told them that in 1987 – the year after nuclear power devised Global Warming, to mask the Chernobyl incident.
So they have chosen NO and NO2 (NOx). The static trace gas, that fertilise plant life – at 1 part per billion in the air. Main source lightening and wood fires.
Both petrol and diesel cars produce very little of it: petrol cars are the main source of CO2 – and more NOx than diesels.