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 fast shutter speed is essential to freeze motion. Image by johnthescone. Start by putting your camera into Shutter Priority mode and choosing a shutter speed of 1/500 of a second. This is a good starting point and should be fast enough for most sports and action. If possible, take a few test shots before the main event starts so that you can check how sharp they are.