My biggest concern about CO2 is the cognitive impact it has on humans - at levels 800ppm and higher, mental performance is impacted. It will take a while for the atmosphere to reach this level (hopefully it never does), but it is common inside houses and offices. As atmospheric CO2 rises, it becomes more difficult to ventilate buildings, and human mental performance degrades.
In terms of geoengineering, it seems like these two are our best bets:
In any case it seems absolutely bonkers that we are still selling fossil-fueled-vehicles and building coal power plants when we clearly have the technology and capability to replace both of them.
In terms of geoengineering, it seems like these two are our best bets:
https://en.wikipedia.org/wiki/Stratospheric_aerosol_injectio... to prevent runaway warming. As a side effect, the dispersed sunlight helps plant growth. Solar power generation is negatively impacted though.
https://en.wikipedia.org/wiki/Iron_fertilization to sequester CO2. As a side effect, marine life and fish stocks would be boosted by the greater plankton food supply.
In any case it seems absolutely bonkers that we are still selling fossil-fueled-vehicles and building coal power plants when we clearly have the technology and capability to replace both of them.