I think they are serious and increasingly, CO2 removal from the atmosphere becomes closer to reality. The goal here is poulation reduction and worldwide crop failure due to reduced CO2 is one way to accomplish that. With Bill Gates and other zillionaire techies convincing themselves they can attain immortality by copying their nervous systems into the Great Machine the rest of the world’s population becomes superfluous to them.
The goal here is poulation reduction
spreading fine dust of volcanic rock is potentially a good way to reduce the population of farm workers/farm families/harvestors. Long-term exposure may lead to serious lung diseases.