The "spray" is - according to Dr. Len Horowitz and other researchers - aluminum "dust" put in the fuel. The "excuse" is to "stop global warming", but the real reason is to 1)make us breath aluminum to weaken our immune systems, and 2) the aluminum falls from the sky and drags with it upper-atmosphere viruses to further attack our immune system.

To view the patent for the "aluminum dust in the fuel" plan, check out Dr. Horowitz's book "Death in the Air" or check out
www.tetrahedron.org/