The United States Geological Survey estimates that (as of 2005, the most recent year for which data is available) we withdraw 410 billion gallons of water a day, including both fresh and saline water. Most (80%) of these withdrawals go to thermoelectric power plants (for cooling) and agriculture (for watering crops).
Level 2 is the second darkest hair color level. It is usually used to describe a natural black, and is the natural color of most people who have naturally black hair along with Level 3, soft/light black hair. Refer to the hair color chart. Most drugstore black hair shades are Level 2, medium black. Level 2 hair color is best suited to people whose natural hair color is between Level 2 and Level 3.5.
These numbers refer are codes for the colors achieved through the use of the dye in question. Specifically, the numerals refer to the light-level of the color in question. When gauging haircolor, a scale of 1 to 10 is used to represent the lightness of the color of the hair. 1 is the darkest possible color level and would be a dark, dark brown or black, while a 10 represents the lightest possible color and would be a platinum or pale yellow blonde. The exact color achieved is determined by the lightness level and base colors in the hair dye. Knowing this allows you to know that a level 3 with a red base color would probably be a rich warm color like an auburn or chestnut brown.