Weather Control: Use of Asphalt Coatings To Tap Solar Energy.
Coating the ground with black asphalt will increase soil temperatures as much as 19 degrees F. On the other hand, if freshly applied asphalt is used as a binder for a white material such as gypsum or lime, subsurface temperatures can be dropped as much as 24 degrees F. The cost and permanence of such coatings might permit their use to cover very large areas of the earth, and the coatings might prove effective in modifying weather.
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