Aussie Bob, if you regard weather modification aka cloud seeding, as chemtrailing, then you hold the same misinformed, deluded view as the average chemmie.
Weather modification has been around since the 1940s, is legal, regulated,carried out by light aircraft and occurs INSIDE clouds below the freezing level.
Geoengineering is PROPOSED to take place in the stratosphere and the mooted flow rates would render the activity invisible.
Do not make the chemmie error of conflating the two terms. They are worlds apart and any attempt to link them shows you don't know what you are talking about.