There are plenty of reasons the government would invest heavily in weather modification

Man-made global warming was mentioned in the 1960s in U.S. government documents on weather modification
newstarget.com

Man-made global warming was mentioned in the 1960s in U.S. government documents on weather modification

Chemtrails expert Peter Kirby has identified one of the earliest known mentions of manmade global warming, and not surprisingly, the reference was found in a government document about weather modification. Kirby, who penned the book Chemtrails Expose