> Spraying a form of sulfur from a plane is incredibly cheap. A full programme would cost less than $20b per year. That’s much cheaper than carbon removal ($600b per year, to remove just 10% of annual emissions @ $100 / tCO2).

It is 30x higher both in time and cost to capture carbon. At $20B/yr geoengineering the atmosphere can be done for 50+ yrs. In 50yrs, carbon capture would need $30T vs only $1T for spraying sulfur. Carbon capture as a long-term solution doesn't make sense. Also, how much carbon you can capture in 50yrs? At 10% of annual emissions, you can probably reach 30% by the end of 50yrs. Carbon capture is still leaving 70% carbon in the environment. It's a make believe solution build to give us false sense of action for saving climate.