can't find the global warming/cars thread

so I'll just start a new one! I remember there being some discussion (Ed from the UK?) about the virtues of diesel vs. hybrids and saw this a minute ago: http://autos.yahoo.com/green_center-article_110/. Not all that striking or anything, altho I wasn't aware that new diesel cars are banned entirely in California (in addition to 4 other states).