Hydroelectricity is a major source of energy for electricity generation, but it is not commonly used for transportation.

Rail travel is generally considered to be the most energy-efficient mode of transportation, as it can transport a large number of people or goods with relatively low energy consumption.

Carbon dioxide is the primary greenhouse gas emitted by transportation activities, primarily due to the combustion of fossil fuels.

All of the options listed are key strategies for reducing energy consumption in transportation.

Energy conversion efficiency refers to the amount of energy lost during the conversion of one form of energy to another, such as from electrical energy to mechanical energy in an electric vehicle.

Solar energy, wind energy, and geothermal energy can all be used to generate electricity, which can then be used to power electric vehicles.

Energy conversion refers to the process of changing energy from one form to another, such as from electrical energy to mechanical energy in an electric vehicle.

Diesel vehicles do not use electricity as their primary energy source, they rely on the combustion of diesel fuel.

Rolling resistance is the energy required to overcome the friction between the tires and the road surface.

Electric vehicles do not use fossil fuels as their primary energy source, they rely on electricity stored in batteries.

Kinetic energy is the energy of motion, and it is the energy required to accelerate a vehicle from a standstill to a certain speed.

Electric vehicles do not use human power as their primary energy source, they rely on electricity stored in batteries.

Gravitational resistance is the energy required to overcome the force of gravity when a vehicle is moving uphill.

Electric vehicles do not use animal power as their primary energy source, they rely on electricity stored in batteries.

Air resistance is the energy required to overcome the resistance of the air when a vehicle is moving.