Rough calculation: Riding an electric scooter "burns" about 270000 joules per km. Walking, about 217568. Not significant difference, especially as relatively few people are riding electric scooters with meaningful frequency/distance. 1 gallon gas ~= 142 km walking.
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How many Calories of diesel fuel (for farm equipment and transport) and natural gas (used to produce fertilizers and power cooking equipment) are consumed to produce, deliver and cook each Calorie of food energy? Human power is fantastically inefficient.
End of conversation
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What about a Self-Powered Skateboard? I save the Environment and I burn calories at the same time.
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You mean those fossil-fuel derived Cheerios calories?
End of conversation
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Thankfully methane isn't a greenhouse gas ... oh wait.
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