The U.S. Department of Justice administers two statistical programs to measure the magnitude, nature, and impact of crime in the Nation: the Uniform Crime Reporting (UCR) Program and the National Crime Victimization Survey (NCVS).
Why is the element mercury important? The element mercury is important because it has a color of silver, it has the properties of a solid and a liquid, it is a naturally found element, and it doesn't break down.
Anyway, the likely reason that green is important is that plant life was a very large part of what we needed to look at for a very long time, and the same for the ancestors of humanity. If you live in a suburb it might be hard to notice, but the natural world is almost entirely green when viewed from a distance.