Diesel cars may be be worse than petrol for CO2 emissions, report claims

Tailpipe emissions of black carbon from diesel engines may be up to 50% higher than previously thought, according to new research

Diesel engines may be doing nothing to slow global warming despite being the backbone of Europe's policy to reduce car emissions, a new report claims.

Tailpipe emissions of sooty 'black carbon' could be as much as 25-50% higher than the EU estimates for cars made before 2005, says the paper by Professor Erckard Helmers of Triers University.