There is another, much more efficient form of geoengineering, which isn’t harmful.
Assuming carbondioxide (CO2) in the atmosphere is a major contributor to the present climate change, all we have to do is to remove it.
Can it be done?
We know it can, as the chemical industry is already doing exactly that on a rather large scale, extracting about 120 megaton (120,000,000 ton) of CO2 a year from the atmosphere.
This CO2 is used to produce a range of product, such as glue, fertilizer, lithium batteries, medicine, etc.
Other possible use is artificial diesel produced by catalysis. The process has been known since the 1920’es, e.g., US patent no. 1,746,464, applied 1926, published 1930, and was widely used in germany during WW2. We burn the fuel and extract the CO2 for re-use.
The method used today is mainly catalysis CO2+H2O to CO+H2+O2 followed by the Fischer-Tropschs synthesis, where CO+2H2 is catalyzised to carbonhydrids.
The “pollution”, rest product, from the proces is O2 (pure oxygen) which can be compressed and sold.
Unstable wind energy can be used to remove CO2 from the atmosphere and as the energy source for catalysis. As oppsed to the use of wind energy for electricity in industry and households, it doesn’t matter if wind power is only available e.g. at night or Sunday through Wednesday
The German Bundesforschungsministerium (Federal Ministry of Education and Research) granted 100 million Euro for research in the use of CO2 and improved catalysis processes under the project “Technologien für Nachhaltigkeit und Klimaschutz” (Technologies for sustainability and climate protection). German engineers obviously see possibilities where others see obstacles.