Not only in thedieselengineemissionsof CO2have beenfar ahead of thegasoline engine,butin the nearfuture,the sulfur content offuelwillbe less thangasolineengines.All along, thecar exhaustare considered to becaused bythe greenhouse effectis one important reason.TheUnited States and Chinaare consideredthe two largestCO2 emissionscountries.According to the survey,the 2004 Europeancarmarket,withnearly half ofnew carsarenew greendiesel.The roadina carinthe United States, butonly 1%using adieselengine.The reason is simple,the U.S. consumerhas the world'slowestgasoline prices.But nowthe United Statesmarketgas pricesclose tothe same period inthe history ofthe highest level,which makesAmerican consumershaveturnedto pay attention tothose who cansave moneyfor theireconomy cars.Two years ago,in the U.S.auto market, onlytwo carsusingdieselengines.Withtoday'srisinggasoline prices,has13dieselvehiclesin the U.S.auto market,butby 2006that there will be6new car market.When themotor vehicledieselengineswill reach nearly20 species.President Bushsigned thedocumentsondiesel engines,diesel vehiclesfor the futureindicateaway forward.U.S. policymakersand consumershave found thatdieselisagood choice.For China,diesel vehiclesis alsoagood choice.Under the conditions ofthe market mechanism, the use ofdieselenginevehicleswillhave a broaderoutlook.