I believe they're trying to chemically blocking the sun (using sulfur dioxide) rather than physically blocking it.
It is obvious we're not gonna fix this by changing our habits, so I'm all for a technological solution. It will have unforeseen consequences and we will deal with those, too. Humankind is nothing but adaptable.
I love how we now have to monitor the content the generation that told us "Don't believe everything you see on the internet." watches like we would for children.