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.
If you want to photograph something that is moving, you need a fast shutter speed. 1  Use 1/500 for general photography of everyday events, sports, and subjects. 2  Use 1/1000-1/4000 when shooting subjects that are extremely fast and up close. 1/1000-1/2000 works well when photographing birds. Typically only the denominator is marked on the camera. 2  For example, 125 means 1/125 second. 3  Some cameras allow you to take photos at a shutter speed in full seconds, such as 1, 2, or 10 seconds. 4  This is used for low light photography and a lot of movement.