The most eco-friendly form of transportation... is walking... bare-foot.
That'll give you the lowest carbon footprint, of all.
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Also, xoxoxoBruce: The pen is mightier than the sword, whilst actions speak louder than words, because a strongly-worded letter (action + pen) will do more for your cause, than yelling like a mad-man whilst brandishing a sword (word + sword!)
I hope I've cleared your confusion.
