The roar of a jet engine, the vroom of a car, the vibration of a moving ship.

These sounds and sensations, commonly associated with travel and motion, share a common source: fossil-fuel-powered engines.

But as regulators and businesses around the world try to reduce carbon emissions, airplanes, automobiles and ships are going electric. It's good for the environment, but it also means travel itself may be changing. Here's a look at a few of the initiatives that are underway.

Air

Starting later this year, Mokulele Airlines, of Hawaii, and Ampaire, a California-based electric airplane startup, will begin testing a hybrid

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Land

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Sea