You don’t believe in cloud seeding? They are really open about spraying heavy metals into clouds from aircraft.
i know they experiment, trying to make it rain. jets have left contrails since they were invented. silver iodide, which has a structure much like ice crystals, is what they SAY they seed clouds with to make it rain. it works...sort of...now and then. never seen any mention of "heavy metals" used. would seem to be a bad idea, since most of them i have read about are bad for the environment.