his is an interesting article, unfortunately I can only find danish and norwegian copies of it.
http://ing.dk/artikel/97302-norsk-miljoeminister-kraever-forbud-mod-benzinbiler-indenfor-seks-aar
http://ing.dk/artikel/97302-norsk-miljoeminister-kraever-forbud-mod-benzinbiler-indenfor-seks-aar