Come on everyone, this is supposed to be a technical forum.
Yes, that's why I am
firmly against blotting out the sun. We need the sun for power (because like it or not, we are running significant power from it already), we need the sun for oxygen (photosynthesis), we need the sun for probably a really wide range of reasons I cannot come up with myself. Basically you are going to replace one problem with a whole range of new ones.
Climate change is not just an issue of heat. Even if you blot out the sun, you'd still be stuck with the production chemical gasses like CO2, NO2, etc which have actually been proven to be detrimental on health. In the most simplistic terms: having more CO2 and less O2 for beings who need oxygen to survive, basically most life form on earth, is not really a great thing.
Hoping for a cyclical cool down of the planet and hoping we can create enough heat to, you know, avoing having the cycle freeze us all to death seems to hold more merit.