One of the theories as to the reason for this program... is to mitigate global warming. I think we need to be careful not to blindly accept this reasoning even though there are patents out there which seem to support this theory. Years ago , closer to when this program began, I remember people predicting that at some point the governments would admit the chemtrail program was real but that it was for the mitigation of global warming. Just because there were proposals for mitigating global warming using particulates spewed into the air, doesn't mean that this is the purpose. Due to the covert psychological warfare tactics used every day on the American people, the patents and or proposals could be planted. Furthermore Patrick Minnis at NASA admits that jets make persistent contrails. Even though he says this is true he claims these expanding trails are normal...which is pretty obvious that they are NOT. He has said that persistent contrails actually can cause global warming and have. So why...if global warming is real....would they be creating cloud cover to produce global warming??? The link below speaks to this issue
As to the purposes of this program, I think that the following are some possibilities. 1. weather modification and weather warfare 2. tracking by satellite the weather patterns they are creating 3. enhancing cell phone and military communications through creating some sort of plasma screen 4. protecting us from ozone holes that their experimentation has caused 5. An added benefit at some point could possibly be that these particulates could be used as a projection screen for holographic / spectral images. I do not agree with the popular theory being spread that chemtrails are being used to kill us off. This explanation is being used to distract from the real reasons and to make chemtrail activists appear a bit loony which then discredits the whole movement. If they were spraying global areas with this purpose in mind...everyone would be affected, including the animals. This is not to say that there are not side effects inherent to whatever is in the spray....such as aluminum or barium...etc. There are many other more focused ways to make us sick...chronically...to keep the cash cow flowing for the drug and other medically oriented corporations. Areas of the globe have been sprayed with biologicals and mosquitoes, etc but these were not global programs...they were focused and directed...and then monitored.
Homework....think about what commercial segments of our population benefit from sunlight and good weather...farmers, solar companies...etc....and speak out to them in a rational manner.