evidence: Comments posted by Instagram users suggest that many believe the claim that HAARP is manipulating the weather, with some citing it as proof that climate change does not exist. Others refer to a similar baseless conspiracy theory that alleges contrails are biological or chemical agents used covertly by governments to poison or vaccinate populations. [...] "HAARP transmits high power radio waves in the range 3 - 30 MHz [one million hertz] which are absorbed by the ionosphere, causing heating and turbulence in the ionospheric plasma," Professor Dyson said. "The ionosphere extends upwards from about 60 km, well above Earth’s weather systems, so HAARP has no effect on weather systems," he said. "HAARP heats the ionosphere at about 100 km and above depending on the transmitted frequency."