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.
The brown gene alleles regulate the amount of melanins which are synthesized (eumelanin an pheomelanin are two common melanins). Generally, if more eumelanin is present, the color of the hair is darker; if less eumelanin is present, the hair is lighter. Pheomelanin colors hair orange and yellow. Everybody has some of both pigments. Hair color is a function of the relative amounts of these two pigments. The amounts of eumelanin pigments determine the varying darkness ranging from Ebony (BRN 1, dark black) to very light brown (BRN 19, sandy blonde).