Well, the argument concerning "global warming" is another, and not one where the evidence clearly states "x is happening". Actually, the weather satilites showed a slight, but insignificant cooling trend accross global temperatures. Unfortunately I leant some of those journals I had received in the mail sometime back, and haven't received them back again... That is another topic though...
Looking at some suggestions though (and some people did do a better job of presenting their positions, then a carte blanche over-generalization); it seems that some have got the impression that every American (or perhaps just most) drive Hummers...
Lets put this in some perspective... After going for dinner tonight, I payed closer attention to the vehicles on the road then normal; largely because of the discussion. Keep in mind that this year for instance, I might have seen at most 5 hummers on the road around here, hardly the average American vehicle...
Anyhow, parked next to me for instance, in the lot when I left there were only 2 SUVs and 8 cars beside my own. That's a total of 2 SUVs to 9 cars... Otherwise, there really wasn't anything in the lot, being late at night...
Driving past (on the road), almost every vehicle was a car... Sometimes, the generalization doesn't fit the overall reality, which people percieve on a day to day basis. Yes there are some hummers (and actually jeeps are more common here in Albuq then SUVs), but it isn't anything like America's favorite and most popular vehicle...
Actually, in terms of pollution, dump trucks can be about the worst. One hasn't lived until they've had to ride behind a dump truck, bellowing out thick black smoke, which gets pulled in by one's air vents
BTW, a poll on just what people do drive here, might be interesting...