There are lots of ideas for tackling this problem. I've seen a few documentaries with ideas like the one you described. There is lots of talk about potential solutions, just not enough actual work being done. But at the end of the day the best solution is to slow down our pollution, not try and mask it. (you could mask it, but continuing to increase pollution levels at the same time would be stupid) It might not make sense to you, it doesn't make much sense to anyone who doesn't extensively understand the physics involved (me included). But the researchers around the world who do understand how the climate works historically/and today just follow the facts and publish what they find. It seems pretty clear to them that we are heading down the wrong track. One part of climate science that really made me think was when I realized how much impact the greenhouse effect has on the climate. Without it, the earth would be a ball of ice. So you can kind of imagine how slightly adjusting it could impact the global climate system over relatively short periods of time. Of course the greenhouse effect is changing all the time, and it's just another factor in all the massive energy equations, but without something to cancel it's increase out the only way for temperature to go is up really.