No, this is not a long-term replacement for bringing down carbon emissions (not least, because carbon also acidifies our oceans), but if you look at the horrible effects climate change is already causing now, imagine how a world will with average temperature raised by 1.5° or 2.0° Celsius.
What are those "horrible effects"? And how do you know the cure won't be worst than the supposed "horrible effects" it is meant to make disappear?
(think more draughts, much more intense wildfire seasons, intense rain events, nature's rhythm which is depending on temperature being disturbed).
And I don't know if the "cure" will be worse, that's why for now, I'm only advocating for research into solar geoengineering. (But as the stratospheric release of sulphuric aerosols is also a natural occurring phenomena -- think volcanoes -- it is not something completely new we would be doing here.)
It gets very overhyped by campaigners but global climate change is still going to be very expensive to the tune of tens of trillions of dollars and tens or hundreds of millions of premature deaths.