http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1='5003186'.WKU.&OS=PN/5003186&RS=PN/5003186.................This site contains information about a patent on a process for mitigating global warming by means of dispersal of various agents from commercial, or military aircraft. My brother has been looking into this, since he is convinced that the long " jet trails " we are seeing in abundance on various days, and even at night, are part of an ongoing project being carried out by our government in an attempt to slow down the effects of runaway global warming and its impacts on humanity. My brother has seen information that suggest that any normal contrail of jet aircraft should last for only up to around 2 minutes, and only then under the certain circumstances. Of course the jet trails being left these days are many times, very lengthy in duration, lasting many minutes to hours, and the trails expand in size and sometimes are so numerous that they fill the sky with a sort of thin haze. Its an interesting subject, and you can find plenty of various info by doing a Yahoo search under " Chemtrails ". Following is a brief explanation of the patented process listed at the site above : A method is disclosed for reducing atmospheric warming due to the greenhouse effect resulting from a greenhouse gases layer. The method comprises the step of seeding the greenhouse gas layer with a quantity of tiny particles of materials characterized by wavelength-dependent emissivity or reflectivity, in that said materials have high emissivities in the visible and far infrared wavelength regions and low emissivity in the near infrared wavelength region. Such materials can include the class of materials known as Welsbach materials. The oxides of metal, e.g., aluminum oxide, are also suitable for the purpose. The greenhouse gases layer typically extends between about seven and thirteen kilometers above the earth's surface. The seeding of the stratosphere occurs within this layer. The particles suspended in the stratosphere as a result of the seeding provide a mechanism for converting the blackbody radiation emitted by the earth at near infrared wavelengths into radiation in the visible and far infrared wavelength so that this heat energy may be reradiated out into space, thereby reducing the global warming due to the greenhouse effect.