Guardian: Diesel engines may be doing nothing to slow global warming despite being the backbone of Europes 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.
On this analysis, some 20m cars in use since the 1990s may each have produced 40-80g of CO2 equivalent per kilometre more than previously thought.
However,...