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Most automobiles in use today are propelled by gasoline (also known as petrol) or diesel internal combustion engines, which are known to cause air pollution and are also blamed for contributing to climate change and global warming.[14] Increasing costs of oil-based fuels, tightening environmental laws and restrictions on greenhouse gas emissions are propelling work on alternative power systems for automobiles. Efforts to improve or replace existing technologies include the development of hybrid vehicles, and electric and hydrogen vehicles which do not release pollution into the air. Petroleum fuels Main article: Petroleum fuel engine Diesel Main article: Diesel engine free articles directory Diesel-engined cars have long been popular in Europe with the first models being introduced as early as 1922 [15] by Peugeot and the first production car, Mercedes-Benz 260 D in 1936 by Mercedes-Benz. free articles dir What is a slow cooker ectory The main benefit of diesel engines is a 50% fuel burn efficiency compared with 27%[16] in the best gasoline engines. A down-side of the Diesel engine is that better filters are required to reduce the presence in the exhaust gases of fine soot particulates called diesel particulate matter. Manufacturers are now starting to fit[when?] diesel particulate filters to remove the soot. Many diesel-powered cars can run with little or no modifications on 100% biodiesel and combinations of other organic oils. Gasoline free articles directory Main article: Petrol engine 2007 Mark II (BMW) Mini Cooper Gasoline engines have the advantage over diesel in being lighter and able to work at higher rotational speeds and they are the usual choice for fitting in high-performance sports cars. Continuous development of gasoline engines for over a hundred years has produced improvements in efficiency and reduced pollution.