We aren't doing it because pumping gases into the atmosphere does more than just reduce temperature. Sulfur compounds, for example, dissolve in the clouds and make them acidic.
So does the CO2 itself. The oceans are getting more acidic already, killing shellfish and throwing off food webs.
Throwing additional geoengineering on top of the geoengineering we're already doing will almost certainly cause as many problems as it solves. It would be so much simpler, cheaper, and more effective to just stop digging carbon out of the ground and putting it in the sky.
So does the CO2 itself. The oceans are getting more acidic already, killing shellfish and throwing off food webs.
Throwing additional geoengineering on top of the geoengineering we're already doing will almost certainly cause as many problems as it solves. It would be so much simpler, cheaper, and more effective to just stop digging carbon out of the ground and putting it in the sky.