chemtrail

A contrail consisting of chemicals or biological agents deliberately sprayed at high altitudes, according to certain conspiracy theories.

You and me watching / Chemtrails is where we belong / That's what I mean when we talk in this jetstream

“We are going to stop this crime,” Kennedy [RFK Jr], who is known for his contrarian stances on vaccines and offshore wind farms, wrote about chemtrails on X in August.[…] Now, scientists are faced with a resurgent focus on chemtrails amid a related, more substantive, debate over whether actual modifications to the Earth’s atmosphere should be made in a desperate attempt to slow global heating.

To spray a contrail of this kind.