Cooling the Earth with a cloud of small spacecraft near the inner Lagrange point
This strategy, to get rid of some sunlight, doesn't fix our problem with CO2.  In fact, it's likely to make the problem worse.Our planet has two primary natural methods for lowering atmospheric CO2.  One, natural weathering, is not impacted with this strategy.The other, plantlife, is absolutely affected.  If you were to take 10% of sunlight away from Earth, then it logically follows that plants would get 10% less sunlight to convert CO2 into starches and H2O into oxygen.  The resource you're trying to constrain, in the name of fighting effects of rising CO2 levels, is the very resource you need in order to fight rising CO2 levels.Sure, blocking or deflecting some light might lower Earth's temperatures temporarily, but you'd exacerbate CO2 levels semi-permanently.We, as a community, need to come to the realization that our CO2 problem is not strictly a temperature problem.