Wild-fires and urban fires are a real concern in many countries, and can involve considerable loss of life and money. The standard methods of tackling these fires usually involve pouring lots of water over the burning areas, whether from fire pumps or airborne craft.
There are other approaches which could be more effective.
- Instead of pouring water on a fire, spray it with snow. Snow-making machines are available, they would need to be made portable.
- Instead of dropping water from the air, drop fine ...