Ideally, a hydrogen fuel-cell vehicle has no environmental impact. Energy is produced by combining hydrogen with oxygen pulled from the atmosphere, and the tailpipe emission is water. The hydrogen fuel could come from a number of sources (Iceland recently started pulling it out of the ground).
A fast shutter speed such as 1/400th of a second will produce a series of crisp frames that have a choppy look when played back. A slow shutter speed such as 1/30th of a second, on the other hand, will produce a series of slightly blurred frames that have a smoother look when played back.
A 35mm camera that is generally favored in sports photography can provide the high shutter speed necessary for action shots. Besides shutter speed, the speed of the film also plays a role. Higher film speed enables higher shutter speeds. A film speed of 100 is inadequate in sports photography.