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).
4) Fast, Slow and Long Shutter Speeds. Fast shutter speed is typically whatever it takes to freeze action. For me, it is typically above 1/500th of a second for general photography and above 1/1000th of a second for bird photography. NIKON D700 @ 420mm, ISO 450, 1/2000, f/5.6.
When taking photos of fast moving subjects, itâs important to use the correct camera settings in order to obtain fast shutter speeds. Many photographers use Shutter Priority mode when photographing sports. However, some compact digital cameras donât have semi-automatic or manual modes. If yours doesnât, use Sports, Kids and Pets, or Fast Shutter Speed mode. Obtaining a fast shutter speed with a compact digital camera can be especially difficult when light is low.