The San Francisco Chronicle tries to answer the question of how to determine the "greenest" form of travel for your specific needs.
They compared and contrasted car, airline and train travel with various carbon footprint scenarios for all.
They determined that: "It's either cut back on carbon emissions in applications where it's relatively easy or decide that our only truly green alternative is to stay home."
Read the full story: No easy answer to "greener" travel mode
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