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Another problem is that of abandoned mines. Thereare some 20,000 abandoned or existing minesin Colorado. Water drains out of those which havebeen filled due to a rise in the water table. Inaddition to this, there are large amounts of materialwhich have been dragged out of the mines,dump heaps and so forth, through which rain andwater drain, removing various chemicals. Theproblem here is to look at the water which comesout .of the mines and these large piles of refuseto see what kind of pollutants there are in them,and see what possible ways there are to removethe harmful elements by chemical or physical means.A yet untested theory by Dr. Norhiko Fukuta, acloud physicist, is the concept of building largewater fountains to be scattered around the city,which will scrub the atmosphere of pollutants.Most pollution exists between ground level and300 feet, and if you can make large fountains andspray them properly, you can do a great deal,Fukuta feels, to scrub the atmosphere. Fukuta isalso researching nucleation of clouds to form rain,the prevention and control of hurricanes and thedispersion of fog over harbors and airports.59