Transportation is a big deal when it comes to greenhouse gas emissions. As this graphic from the magazine Sierra shows transportation accounts for more than a quarter of all U.S. greenhouse gas emissions.
The graphic shows how many kilocalories per mile that different forms of transportation require and the percentage of workers that use the different forms.
75% drive alone which, by a grand margin, that form of transportation uses the most kilocalories per mile.
Can you guess which form of transportation is the most efficient?