Changes

==Pollution==

==Pollution==

Under certain conditions, diesel engines produce black smoke, see [[Rolling Coal]].  They also produce larger volumes of [[Nitrogen Oxides]] than gasoline engines.  Modern diesel engines are tuned to minimize smoke production and they can be fitted with urea injection systems to reduce emission of nitrogen oxides.

Under load, diesel engines produce black smoke, see [[Rolling Coal]].  They also produce larger volumes of [[Nitrogen Oxides]] than gasoline engines.  Modern diesel engines are tuned to minimize smoke production and they can be fitted with urea injection systems to reduce emission of nitrogen oxides.

In the United Kingdom, [[Global warming]] hysteria has led to confused policies on diesel pollution.  The UK government initially promoted diesel cars as "environment friendly" because they produce less [[carbon dioxide]] than petrol (gasoline) cars.  Then they discovered that, because of the growth in diesel car use, air pollution from nitrogen oxides was rising. Diesel cars are now unpopular with the UK government and a scrappage scheme (similar to the [[Cash for Clunkers]] scheme in the United States) may be introduced.<ref>[https://www.express.co.uk/life-style/cars/762900/Diesel-car-van-scrappage-scheme-2017-new-clean-electric-vehicle-discount-deal Diesel car scrappage scheme]</ref>

In the United Kingdom, [[Global warming]] hysteria has led to confused policies on diesel pollution.  The UK government initially promoted diesel cars as "environment friendly" because they produce less [[carbon dioxide]] than petrol (gasoline) cars.  Then they discovered that, because of the growth in diesel car use, air pollution from nitrogen oxides was rising. Diesel cars are now unpopular with the UK government and a scrappage scheme (similar to the [[Cash for Clunkers]] scheme in the United States) may be introduced.<ref>[https://www.express.co.uk/life-style/cars/762900/Diesel-car-van-scrappage-scheme-2017-new-clean-electric-vehicle-discount-deal Diesel car scrappage scheme]</ref>