“HAARP’s use of the ionosphere through radio frequencies, explains Dr. Nick Begich, co-author of Angels Don’t Play This HAARP, also triggers earthquakes and volcanoes.  Begich quotes Clinton’s Secretary of Defense William S. Cohen, who said in 1997 at a conference on terrorism: “Others are engaging even in an eco-type of #terrorism whereby they can alter the climate, set off #earthquakes #volcanoes remotely through the use of electromagnetic waves.” 
Pragmatically, the US wouldn’t be worried about such weapons unless they knew with certainty that they were feasible and had, in all likelihood, already developed them itself.
In “Atmospheric Geoengineering: Weather Manipulation, #Contrails and #Chemtrails “ which was named the 9th most censored story in 2012 by Project Censored, a brief history of known geoengineering events was published.  From that report, the IPCC’s co-founder, the World Meteorological Organization, complained six years ago, in 2007, that: “In recent years there has been a decline in the support for weather modification research, and a tendency to move directly into operational projects.” 
But the IPCC remains mum on these projects, except to deny they exist, while at the same time urging in its Summary that they must continue or global warming will spike. The 2013 IPCC report states: “Theory, model studies and observations suggest that some Solar Radiation Management (SRM) methods, if practicable, could substantially offset a global temperature rise and partially offset some other impacts of global warming, but the compensation for the climate change caused by greenhouse gases would be imprecise (high confidence).” [emphasis in original]
To claim that solar radiation management methods (which include chemtrails and HAARP-induced changes) are “unimplemented and untested” is patently absurd, and contradicts a library of evidence.” https://www.globalresearch.ca/military-weather-modification-chemtrails-atmospheric-geoengineering-and-environmental-warfare/5356630