AskPablo: Summer Vacation

With gas prices breaking new records every day I am wondering, is it better for the environment to fly or drive to my summer vacation?
In terms of greenhouse gas emissions, the quick answer is that driving is far better than flying. But let’s see why that is.
According to the Greenhouse Gas Protocol, the internationally accepted process for quantifying greenhouse gas emissions, the emissions from a long-haul (less than 1,000 miles) flight are 180 grams per passenger mile. So a nonstop flight from San Francisco to Boston would create 487 kilograms of carbon dioxide emissions per person (2,708 miles x 180 g/passenger mile), or almost 1 ton for a round-trip. For a family of three, the “carbon footprint” of your vacation would already be almost 3 tons! Generally, larger airplanes are more efficient per mile, so short-haul flights release even more emissions.
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