I remember a book from the 1970s-1980s where something like "dimming the sun" was done to disastrous results? Scientists sprayed something in the atmosphere. Not Snowpiercer :-) . Thanks for any help.
This could possibly be the novel Sunstrike by George Carpozi. it features a rogue scientist creating a shield in space that blocks the light from the sun and causes a mini ice age. Here is a link to the book available via amazon, https://www.amazon.com/Sunstrike-George-Carpozi/dp/0523403658