So that's the official story. But conspiracy theorists say that HAARP has been developed for far nastier reasons than the wordy and impenetrable website would have you believe. Some people believe HAARP has been responsible for unexplained mass extermination of wildlife and that it has the power to trigger manmade earthquakes.
The phenomenon of chemtrails has also been linked to HAARP. It's believed in some quarters that these tracks in the sky may enhance the IRI transmissions. Still other people think chemtrails are evidence of high-altitude aerosol spraying which is carried out for various sinister purposes. Depending on which conspiracy theorist you favour, that could be weather control, biological warfare or mass mind control.
Chemtrails were explored most credibly in the documentary What in the World are they Spraying? about a process called stratospheric aerosol geo-engineering in which chemical dust is sprayed into the air in order to reflect radiation back into space. According to the official trailer this attempt to combat global warming comes at the cost of poisoning our air, soil, crops and drinking water.
It's been difficult separating fact from fiction on this issue but here's my best attempt. HAARP? It does exist. Can it trigger earthquakes? I have no idea but it has inspired a couple of great titles: specifically an article called Is baked Alaska half-baked? and a book entitled Angels Don't Play this HAARP.
Does a process called "cloud seeding" exist? Yes, it's a bona fide form of intentional weather manipulation. Has a terrorist organisation called KAOS created a dangerous weather machine? No, that was just the plot of the 1989 television movie Get Smart, Again!
Are chemtrails real? Some say they are but scientists claim they're just regular vapour trails prolonged by certain atmospheric conditions. All I know is the distinctive sky-tracks I witnessed in Spain are as intrinsic a part of my memories of Barcelona as the Seuss-like spires of Gaudi's architecture.