Chemtrails are nothing more than ice crystals. Your best proof of this is that you don't see them on a hot summer day with clear blue skies. Instead, you will see them as ordinary looking contrails.
Now as for the HAARP program, this could be a juicy conspiracy theory indeed. But not like you think. Have heard that the antenna array actually points down toward the earth's core, and that they are secretly trying to offset the detrimental effects of various vortices, (that have aluminum isotope 26 in their composition), and seem to be slowing the rotation of the earth's iron core.
If the earth's core slows down enough, we could lose our magnetic field, and also our atmosphere. This would cause a worldwide mass extinction. Some folks think we are already well into the onset of this global mass extinction, and that this is evidenced by an accelerated global climate change. How creepy is that?
For a reference on this subject, you may want to watch a film called, "The Devil's Graveyards: Vile Vortices Revealed". They show it on the History Channel once in awhile.