- there are literally hundreds of sites on the web promoting chemtrail idiocy through the use of deceptive images, pseudoscience, and horribly flawed logic;
- social activists who refuse to use their intellects are pushing many people to take this up as a cause, including me;
- those pushing these positions refuse to or are quite incapable of engaging in rational debate, understanding (or even knowing) basic science, or seeing reason.
- population control;
- weather modification;
- psychological manipulation
- population control: it would be much cheaper, faster and more efficient to poison the water system, don't you think?
- weather modification: it's already being done using custom planes (not commercial airliners) and by seeding only the clouds. There's no point seeding the air and there is no evidence that these custom planes are doing that. And please note that weather modification has absolutely nothing to do with climate change. Many sites are conflating the two. They are completely different processes and have completely different outcomes.
- warfare: same as two. We have custom war planes to handle any kind of warfare the government wants to engage in. Chemical warfare is done mostly from the ground or using small war planes dropping chemical bombs. Again. There is no need for commercial airliners to perform this task.
- psychological manipulation: same as 1. it would be much cheaper, faster and more efficient to put drugs in the water system, don't you think?
Climate engineering, also referred to as geoengineering, is the deliberate and large-scale intervention in the Earth’s climatic system with the aim of reducing global warming.
No known large-scale climate engineering projects have taken place to date. Almost all research has consisted of computer modelling or laboratory tests, and attempts to move to real-world experimentation have proved controversial. Some limited tree planting and cool roof projects are already underway. Ocean iron fertilization has been given small-scale research trials.
Most experts and major reports advise against relying on geoengineering techniques as a simple solution to climate change, in part due to the large uncertainties over effectiveness and side effects. However most experts also argue though that the risks of such interventions must be seen in the context of risks of dangerous climate change.
As a rule of thumb it would appear that the scale of risks and costs of each climate engineering option appear to be somewhat inverse: The lower the costs, the greater the risks.[unbalanced opinion] Some have suggested that the concept of geoengineering the climate presents a moral hazard because it could reduce political and public pressure for emissions reduction. Groups such as ETC Group and individuals such as Raymond Pierrehumbert have called for a moratorium on deployment and out-of-doors testing of geoengineering techniques for climate control.