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.
It is this mixture which will determine what color your hair actually is. Simply put, the amount of melanin in your hair determines your hair color. People with dark hair have more melanin than people with light hair. If your hair is black, your body produces more melanin than someone with brown hair. If your hair color is blond, you have less melanin than a person with brown hair.