Det är inte bara gaser som bidrar till växthuseffekten, svarta sotpartiklar bidrar också mycket. Återigen ett dieselmotorproblem.
Citat:
On another front, a greater emphasis on black carbon as a warming agent could affect elements of climate policies in many countries. Most notably, to meet national fuel efficiency standards, many carmakers are making more diesel cars because they get better gas mileage and produce less carbon dioxide.
But diesel engines also produce relatively heavy emissions of black carbon, Dr. Jacobson said, which partly cancels out the benefit.
Från
http://www.nytimes.com/2013/01/16/scien ... l?hpw&_r=0