@Dhico/....Loads of silver foil in the stratosphere should work just fine.
I think we would have to be very sure of what we are doing, before we stuff around at that level. We may precipitate a Mini Ice Age.
Ref: Look at "The year without a summer, after the Mount Tambore eruption in 1815. Elemental forces of nature are massive, compared with our puny efforts.
Fools (politicians?) rush in where wise men dare not to tread....Marum