Gigantic airships aim to damp...

Gigantic airships aim to damp forest fires: "Water will rain down continuously from gigantic airships, which will be kept topped up by passing drop-planes or helicopters. 'It'll be like having a non-stop artificial rainstorm,' says Pope. They suggest using 300-metre-long propeller-powered airships carrying just under one million litres of water and flying high above the flames. From there, adjustable valves on the underside of the balloon--much like large shower heads--will pump out a staggering 200,000 litres an hour over a large area of the fire. They could also have a few water cannon that can be directed over particularly persistent hot spots."