The dangers of blocking the Sun's rays through solar geoengineering for climate change

This video describes the drawbacks of pursuing a world-wide solar geoengineering program meant to block or reflect solar radiation in order to cool the Earth for climate change improvement. The problem with this program is that once it starts we really don't know what regional weather changes could take place. It is generally accepted that there should be a cooling effect, but as far as weather, that is another animal in itself. Another problem is the amount of chemicals they want to use for this. It is estimated that we need at least 50 million tons of chemicals sprayed into the stratosphere for this to work. That is 5 times that amount of ash and chemicals that got spewed into the atmosphere from the well known 1991 Mount Pinatubo volcantic eruption. In addition, they are pretty sure that if we stopped the spraying all of the sudden, the temperatures would spike or rise dramatically. This would be a problem world-wide as we know that as heat waves occur, electricity commonly goes out causing even more problems. In addition, this practice doesn't solve the climate change problem, it only alleviates it. In order to solve it we would still need to reduce carbon emissions, something this program does not address.