My apologies for the quick post - regular length posting will resume tomorrow.
In the meantime, here's a cool infographic from 1bog.org detailing the carbon footprint of transportation modes according to trip length. I learned this in my grad school studies, but it might be surprising to some that (economy) air travel is actually greener than traveling by car, especially over long distances:
But, as is clear from the above, buses are always the greenest non-human-powered mode of travel.
I hope everyone enjoyed the holiday weekend and used green transportation to get where you wanted to go!