According to the GCI, "such proposals all have the characteristics that they are profitable, risk global-scale catastrophic side-effects, and divert everyone's attention from the essential need to reduce Extensive analysis of these options were undertaken by Ben Matthews and David Keith in particular, with the conclusion that no such 'fixes' could be deemed feasible.
Allegations that the USA is already indulging in climate engineering by seeding the upper atmosphere with large quantitities of white powder, leaving so-called "chemtrails", are neither verified nor denied by any competent authority, most such choosing to treat the allegations as fatuous.
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