The U.S. Department of Energy rates intercity rail (from one city to another) and transit rail (subways and commuter rails fall into this category) as the two most efficient forms of transportation.
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Trains. Besides walking and biking, traveling by train remains one of the greenest and most environment-friendly options when getting around. Regardless if electric or diesel-powered, trains emit between 66 and 75 percent fewer carbon emissions when compared to cars and airplanes.
Air travel is convenient and can transport large numbers of passengers, but it has a high environmental impact due to carbon emissions and fuel needs. Gas-consuming vehicles provide convenience and flexibility but have high carbon emissions and contribute to traffic.
Walk, bike or take the train for the lowest footprintOver short to medium distances, walking or cycling are nearly always the lowest carbon way to travel.
Nature tourism or ecotourism is a type of environmentally friendly tourism. Nature tourism is a subvariant of responsible tourism which focuses on areas of nature and wilderness, environmental conservation, and leisure activities involving nature.
The cleanest modes of transportation are walking and biking. Walking to and from the store will not only get you closer to your daily step goal, it will not contribute to air pollution. If you biked one kilometer to the store, your bike's emissions score would be 8.