Greyhound's eco-bus vs. flying...
Which one is greener? I put both to the carbon test.
Image: Greyhound 
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How did Greyhound come up with their 195? or their "1/3" less? Need to know to be able to compare or evaluate. And how full was the bus in their calculations?
BTW: _your_ calc of their calc is saying 2/3 less of Prius (they say 1/3 less). So this is all not very useful yet.
Try again?
If Greyhound is making "1/3 less" emissions than the Prius, you should take 2/3 of the 195 pounds of CO2, not 1/3. This makes the CO2 output for the bus 130 pounds, not 65 pounds.
The key is in the number of passengers.
Grayhound does not state how many passengers are on the bus. If the bus is presumed full then the above estimate could not go any lower. Instead it could go higher if the estimate above is based on a full bus and the bus is traveling at half capacity. In this scenario CO2 emissions per passenger double to 130 pounds.
However, if the Prius has 2 occupants the per passenger emissions are 98 pounds (195 / 2). If the Prius is comfortably full.... More
You neglected THE greenest way to get from Boston to DC. The Amtrak Acela electric train. One gallon of diesel fuel can generate enough electrical power to move a ton of freight (or passengers) 423 miles on rails.
This analysis leaves out plenty, but perhaps the most important is the concept of "climate forcing." High altitude flight has a much greater impact than its carbon contribution might imply.
And more interestingly, the Prius loses the carbon race...
It's more eco to fly than drive a Prius, really? I guess it's necessary to understand how significant the radiative forcing is since it changes the game from beating out the Prius to lagging far behind.
