An article from 2018 published in The Independent revealed, "First ever sun-dimming experiment will mimic volcanic eruption in attempt to reverse global warming."
"Scientists plan to mimic the effects of a massive volcanic eruption in a bid to tackle global warming.
"Plans to geoengineer the atmosphere by blocking out sunlight have been floated before, but an experiment launched next year by Harvard researchers will be the first to test the theory in the stratosphere."
What became of it? They hoped to do it on a large scale, I suppose. What could possibly go wrong?