It's hard to nail down exact figures, but a motorcoach in intercity use seems to dump about four times the amount of CO2 as a big SUV does.

Obviously, the comparison works out favorably for a bus if it carries a bunch of passengers, but this one doesn't.

The website talks about doing 50,000 miles on this tour.

Not sure how many miles a year the average family puts on an SUV, but various sources seem to indicate between 12,000 and 13,000 miles a year.

So a VERY rough calcuation has the Magic Bus burping about sixteen times the amount of CO2 that an SUV dumps in a year.

Assuming it doesn't idle and run the AC at each display point, of course...