If you can invent something that would help improve the environment's condition, what would you like to invent?

If I invent the = a device to improve the enviroment = environment's condition, It would be for water. I = I've heard that we are already suffer = suffering from the lack of water. Other enviroments such as the air and soil are influential to human = humans, but water can affect human's life = humans' lives directly. Most of developing and developed countries have trouble with water pollution because of industrialization.