You say that you figure that spraying stuff in the sky "might" by us some time without explaining how. By just spraying untested items into the atmosphere we are purposefully damaging the environment, the ecosystem and potentially making the situation worse. You also say that you don't know how else to solve this problem when the solution is right there. We don't need to "spray" things into the air to by time, but we can implement certain structures (like the baths in rome) but on a much larger scale. For intance, we could stop using a large amount of resources and try to conserve like with water or electricity in order to reduce the amount of smoke that gets released into the air on a daily. So we don't need to geoengineer the atmosphere to cool the planet, but we can improve our daily life and be able to slow it down.